diff --git a/toolsrc/include/vcpkg/base/files.h b/toolsrc/include/vcpkg/base/files.h
index 0bad428c01d..8f278cd2068 100644
--- a/toolsrc/include/vcpkg/base/files.h
+++ b/toolsrc/include/vcpkg/base/files.h
@@ -22,6 +22,7 @@ namespace fs
     using stdfs::path;
     using stdfs::perms;
     using stdfs::u8path;
+    using stdfs::directory_iterator;
 
 #if defined(_WIN32)
     enum class file_type
@@ -155,9 +156,13 @@ namespace vcpkg::Files
         fs::file_status status(const fs::path& p, ignore_errors_t) const noexcept;
         fs::file_status symlink_status(LineInfo li, const fs::path& p) const noexcept;
         fs::file_status symlink_status(const fs::path& p, ignore_errors_t) const noexcept;
+        virtual fs::path absolute(const fs::path& path, std::error_code& ec) const = 0;
+        fs::path absolute(LineInfo li, const fs::path& path) const;
         virtual fs::path canonical(const fs::path& path, std::error_code& ec) const = 0;
         fs::path canonical(LineInfo li, const fs::path& path) const;
         fs::path canonical(const fs::path& path, ignore_errors_t) const;
+        virtual fs::path current_path(std::error_code&) const = 0;
+        fs::path current_path(LineInfo li) const;
 
         virtual std::vector<fs::path> find_from_PATH(const std::string& name) const = 0;
     };
diff --git a/toolsrc/include/vcpkg/binaryparagraph.h b/toolsrc/include/vcpkg/binaryparagraph.h
index edb2b6a13c6..d556a40c841 100644
--- a/toolsrc/include/vcpkg/binaryparagraph.h
+++ b/toolsrc/include/vcpkg/binaryparagraph.h
@@ -28,6 +28,8 @@ namespace vcpkg
 
         std::string dir() const;
 
+        bool is_feature() const { return !feature.empty(); }
+
         PackageSpec spec;
         std::string version;
         std::string description;
diff --git a/toolsrc/include/vcpkg/commands.h b/toolsrc/include/vcpkg/commands.h
index 9d2d0b6c629..3ce182410f1 100644
--- a/toolsrc/include/vcpkg/commands.h
+++ b/toolsrc/include/vcpkg/commands.h
@@ -139,6 +139,12 @@ namespace vcpkg::Commands
         void perform_and_exit(const VcpkgCmdArguments& args, const VcpkgPaths& paths);
     }
 
+    namespace SetInstalled
+    {
+        extern const CommandStructure COMMAND_STRUCTURE;
+        void perform_and_exit(const VcpkgCmdArguments& args, const VcpkgPaths& paths, Triplet default_triplet);
+    }
+
     template<class T>
     struct PackageNameAndFunction
     {
diff --git a/toolsrc/include/vcpkg/statusparagraphs.h b/toolsrc/include/vcpkg/statusparagraphs.h
index 7fcf0e91626..1fda8131652 100644
--- a/toolsrc/include/vcpkg/statusparagraphs.h
+++ b/toolsrc/include/vcpkg/statusparagraphs.h
@@ -40,7 +40,7 @@ namespace vcpkg
 
         std::vector<std::unique_ptr<StatusParagraph>*> find_all(const std::string& name, Triplet triplet);
 
-        Optional<InstalledPackageView> find_all_installed(const PackageSpec& spec) const;
+        Optional<InstalledPackageView> get_installed_package_view(const PackageSpec& spec) const;
 
         /// <summary>Find the StatusParagraph for given spec if installed</summary>
         /// <param name="spec">Package specification to find the status for</param>
diff --git a/toolsrc/include/vcpkg/vcpkgcmdarguments.h b/toolsrc/include/vcpkg/vcpkgcmdarguments.h
index fe7911ae3fb..e5b26c25afc 100644
--- a/toolsrc/include/vcpkg/vcpkgcmdarguments.h
+++ b/toolsrc/include/vcpkg/vcpkgcmdarguments.h
@@ -86,6 +86,7 @@ namespace vcpkg
         static VcpkgCmdArguments create_from_arg_sequence(const std::string* arg_begin, const std::string* arg_end);
 
         std::unique_ptr<std::string> vcpkg_root_dir;
+        std::unique_ptr<std::string> install_root_dir;
         std::unique_ptr<std::string> scripts_root_dir;
         std::unique_ptr<std::string> triplet;
         std::unique_ptr<std::vector<std::string>> overlay_ports;
diff --git a/toolsrc/include/vcpkg/vcpkgpaths.h b/toolsrc/include/vcpkg/vcpkgpaths.h
index 31d8374f1e6..c95515aeea0 100644
--- a/toolsrc/include/vcpkg/vcpkgpaths.h
+++ b/toolsrc/include/vcpkg/vcpkgpaths.h
@@ -58,6 +58,7 @@ namespace vcpkg
         };
 
         static Expected<VcpkgPaths> create(const fs::path& vcpkg_root_dir,
+                                           const Optional<fs::path>& install_root_dir,
                                            const Optional<fs::path>& vcpkg_scripts_root_dir,
                                            const std::string& default_vs_path,
                                            const std::vector<std::string>* triplets_dirs);
diff --git a/toolsrc/src/vcpkg.cpp b/toolsrc/src/vcpkg.cpp
index c2ee422005b..4e6109c38e0 100644
--- a/toolsrc/src/vcpkg.cpp
+++ b/toolsrc/src/vcpkg.cpp
@@ -62,6 +62,8 @@ static void invalid_command(const std::string& cmd)
 
 static void inner(const VcpkgCmdArguments& args)
 {
+    auto& fs = Files::get_real_filesystem();
+
     Metrics::g_metrics.lock()->track_property("command", args.command);
     if (args.command.empty())
     {
@@ -88,26 +90,26 @@ static void inner(const VcpkgCmdArguments& args)
     }
 
     fs::path vcpkg_root_dir;
-    if (args.vcpkg_root_dir != nullptr)
+    if (args.vcpkg_root_dir)
     {
-        vcpkg_root_dir = fs::stdfs::absolute(fs::u8path(*args.vcpkg_root_dir));
+        vcpkg_root_dir = fs.absolute(VCPKG_LINE_INFO, fs::u8path(*args.vcpkg_root_dir));
     }
     else
     {
         const auto vcpkg_root_dir_env = System::get_environment_variable("VCPKG_ROOT");
         if (const auto v = vcpkg_root_dir_env.get())
         {
-            vcpkg_root_dir = fs::stdfs::absolute(*v);
+            vcpkg_root_dir = fs.absolute(VCPKG_LINE_INFO, *v);
         }
         else
         {
-            const fs::path current_path = fs::stdfs::current_path();
-            vcpkg_root_dir = Files::get_real_filesystem().find_file_recursively_up(current_path, ".vcpkg-root");
+            const fs::path current_path = fs.current_path(VCPKG_LINE_INFO);
+            vcpkg_root_dir = fs.find_file_recursively_up(current_path, ".vcpkg-root");
 
             if (vcpkg_root_dir.empty())
             {
-                vcpkg_root_dir = Files::get_real_filesystem().find_file_recursively_up(
-                    fs::stdfs::absolute(System::get_exe_path_of_current_process()), ".vcpkg-root");
+                vcpkg_root_dir = fs.find_file_recursively_up(
+                    fs.absolute(VCPKG_LINE_INFO, System::get_exe_path_of_current_process()), ".vcpkg-root");
             }
         }
     }
@@ -116,17 +118,23 @@ static void inner(const VcpkgCmdArguments& args)
 
     Debug::print("Using vcpkg-root: ", vcpkg_root_dir.u8string(), '\n');
 
+    Optional<fs::path> install_root_dir;
+    if (args.install_root_dir) {
+        install_root_dir = Files::get_real_filesystem().canonical(VCPKG_LINE_INFO, fs::u8path(*args.install_root_dir));
+        Debug::print("Using install-root: ", install_root_dir.value_or_exit(VCPKG_LINE_INFO).u8string(), '\n');
+    }
+
     Optional<fs::path> vcpkg_scripts_root_dir = nullopt;
-    if (nullptr != args.scripts_root_dir)
+    if (args.scripts_root_dir)
     {
-        vcpkg_scripts_root_dir = fs::stdfs::canonical(fs::u8path(*args.scripts_root_dir));
+        vcpkg_scripts_root_dir = Files::get_real_filesystem().canonical(VCPKG_LINE_INFO, fs::u8path(*args.scripts_root_dir));
         Debug::print("Using scripts-root: ", vcpkg_scripts_root_dir.value_or_exit(VCPKG_LINE_INFO).u8string(), '\n');
     }
 
     auto default_vs_path = System::get_environment_variable("VCPKG_VISUAL_STUDIO_PATH").value_or("");
 
     const Expected<VcpkgPaths> expected_paths =
-        VcpkgPaths::create(vcpkg_root_dir, vcpkg_scripts_root_dir, default_vs_path, args.overlay_triplets.get());
+        VcpkgPaths::create(vcpkg_root_dir, install_root_dir, vcpkg_scripts_root_dir, default_vs_path, args.overlay_triplets.get());
     Checks::check_exit(VCPKG_LINE_INFO,
                        !expected_paths.error(),
                        "Error: Invalid vcpkg root directory %s: %s",
diff --git a/toolsrc/src/vcpkg/base/files.cpp b/toolsrc/src/vcpkg/base/files.cpp
index 0bd1cb893d2..71cc7275ab4 100644
--- a/toolsrc/src/vcpkg/base/files.cpp
+++ b/toolsrc/src/vcpkg/base/files.cpp
@@ -272,6 +272,14 @@ namespace vcpkg::Files
         this->remove_all(path, ec, failure_point);
     }
 
+    fs::path Filesystem::absolute(LineInfo li, const fs::path& path) const
+    {
+        std::error_code ec;
+        const auto result = this->absolute(path, ec);
+        if (ec) Checks::exit_with_message(li, "Error getting absolute path of %s: %s", path.string(), ec.message());
+        return result;
+    }
+
     fs::path Filesystem::canonical(LineInfo li, const fs::path& path) const
     {
         std::error_code ec;
@@ -286,6 +294,14 @@ namespace vcpkg::Files
         std::error_code ec;
         return this->canonical(path, ec);
     }
+    fs::path Filesystem::current_path(LineInfo li) const
+    {
+        std::error_code ec;
+        const auto result = this->current_path(ec);
+
+        if (ec) Checks::exit_with_message(li, "Error getting current path: %s", ec.message());
+        return result;
+    }
 
     struct RealFilesystem final : Filesystem
     {
@@ -699,11 +715,36 @@ namespace vcpkg::Files
             }
         }
 
+        virtual fs::path absolute(const fs::path& path, std::error_code& ec) const override
+        {
+#if USE_STD_FILESYSTEM
+            return fs::stdfs::absolute(path, ec);
+#else // ^^^ USE_STD_FILESYSTEM / !USE_STD_FILESYSTEM vvv
+#if _WIN32
+            // absolute was called system_complete in experimental filesystem
+            return fs::stdfs::system_complete(path, ec);
+#else // ^^^ _WIN32 / !_WIN32 vvv
+            if (path.is_absolute()) {
+                auto current_path = this->current_path(ec);
+                if (ec) return fs::path();
+                return std::move(current_path) / path;
+            } else {
+                return path;
+            }
+#endif
+#endif
+        }
+
         virtual fs::path canonical(const fs::path& path, std::error_code& ec) const override
         {
             return fs::stdfs::canonical(path, ec);
         }
 
+        virtual fs::path current_path(std::error_code& ec) const override
+        {
+            return fs::stdfs::current_path(ec);
+        }
+
         virtual std::vector<fs::path> find_from_PATH(const std::string& name) const override
         {
 #if defined(_WIN32)
diff --git a/toolsrc/src/vcpkg/binarycaching.cpp b/toolsrc/src/vcpkg/binarycaching.cpp
index 0750366fffe..c8e77d938f5 100644
--- a/toolsrc/src/vcpkg/binarycaching.cpp
+++ b/toolsrc/src/vcpkg/binarycaching.cpp
@@ -171,7 +171,7 @@ namespace
                     {
                         fs.copy_file(log_file.path(),
                                      tmp_log_path_destination / log_file.path().filename(),
-                                     fs::stdfs::copy_options::none,
+                                     fs::copy_options::none,
                                      ec);
                     }
                 }
diff --git a/toolsrc/src/vcpkg/binaryparagraph.cpp b/toolsrc/src/vcpkg/binaryparagraph.cpp
index f142c307d22..45638e1f5db 100644
--- a/toolsrc/src/vcpkg/binaryparagraph.cpp
+++ b/toolsrc/src/vcpkg/binaryparagraph.cpp
@@ -62,7 +62,7 @@ namespace vcpkg
                 // for compatibility with previous vcpkg versions, we discard all irrelevant information
                 return dep.name;
             });
-        if (this->feature.empty())
+        if (!this->is_feature())
         {
             this->default_features = parse_default_features_list(parser.optional_field(Fields::DEFAULTFEATURES))
                                          .value_or_exit(VCPKG_LINE_INFO);
@@ -109,7 +109,7 @@ namespace vcpkg
 
     std::string BinaryParagraph::displayname() const
     {
-        if (this->feature.empty() || this->feature == "core")
+        if (!this->is_feature() || this->feature == "core")
             return Strings::format("%s:%s", this->spec.name(), this->spec.triplet());
         return Strings::format("%s[%s]:%s", this->spec.name(), this->feature, this->spec.triplet());
     }
@@ -126,7 +126,7 @@ namespace vcpkg
         out_str.append("Package: ").append(pgh.spec.name()).push_back('\n');
         if (!pgh.version.empty())
             out_str.append("Version: ").append(pgh.version).push_back('\n');
-        else if (!pgh.feature.empty())
+        else if (pgh.is_feature())
             out_str.append("Feature: ").append(pgh.feature).push_back('\n');
         if (!pgh.depends.empty())
         {
diff --git a/toolsrc/src/vcpkg/build.cpp b/toolsrc/src/vcpkg/build.cpp
index fe17c490af4..b3168075dfa 100644
--- a/toolsrc/src/vcpkg/build.cpp
+++ b/toolsrc/src/vcpkg/build.cpp
@@ -890,7 +890,7 @@ namespace vcpkg::Build
         ExtendedBuildResult result = do_build_package_and_clean_buildtrees(paths, action);
 
         fs.create_directories(abi_package_dir, ec);
-        fs.copy_file(abi_file, abi_file_in_package, fs::stdfs::copy_options::none, ec);
+        fs.copy_file(abi_file, abi_file_in_package, fs::copy_options::none, ec);
         Checks::check_exit(VCPKG_LINE_INFO, !ec, "Could not copy into file: %s", abi_file_in_package.u8string());
 
         if (binary_caching_enabled && result.code == BuildResult::SUCCEEDED)
diff --git a/toolsrc/src/vcpkg/commands.cpp b/toolsrc/src/vcpkg/commands.cpp
index 1f424a55937..0db6ddb8f98 100644
--- a/toolsrc/src/vcpkg/commands.cpp
+++ b/toolsrc/src/vcpkg/commands.cpp
@@ -17,6 +17,7 @@ namespace vcpkg::Commands
     {
         static std::vector<PackageNameAndFunction<CommandTypeA>> t = {
             {"install", &Install::perform_and_exit},
+            {"x-set-installed", &SetInstalled::perform_and_exit},
             {"ci", &CI::perform_and_exit},
             {"remove", &Remove::perform_and_exit},
             {"upgrade", &Upgrade::perform_and_exit},
diff --git a/toolsrc/src/vcpkg/commands.setinstalled.cpp b/toolsrc/src/vcpkg/commands.setinstalled.cpp
new file mode 100644
index 00000000000..344892fe83a
--- /dev/null
+++ b/toolsrc/src/vcpkg/commands.setinstalled.cpp
@@ -0,0 +1,111 @@
+#include "pch.h"
+
+#include <vcpkg/base/system.print.h>
+#include <vcpkg/commands.h>
+#include <vcpkg/globalstate.h>
+#include <vcpkg/help.h>
+#include <vcpkg/input.h>
+#include <vcpkg/install.h>
+#include <vcpkg/remove.h>
+#include <vcpkg/portfileprovider.h>
+#include <vcpkg/vcpkglib.h>
+
+namespace vcpkg::Commands::SetInstalled
+{
+    const CommandStructure COMMAND_STRUCTURE = {
+        Help::create_example_string(R"(x-set-installed <package>...)"),
+        1,
+        SIZE_MAX,
+        {},
+        nullptr,
+    };
+
+    void perform_and_exit(const VcpkgCmdArguments& args, const VcpkgPaths& paths, Triplet default_triplet)
+    {
+        // input sanitization
+        const ParsedArguments options = args.parse_arguments(COMMAND_STRUCTURE);
+
+        const std::vector<FullPackageSpec> specs = Util::fmap(args.command_arguments, [&](auto&& arg) {
+            return Input::check_and_get_full_package_spec(
+                std::string(arg), default_triplet, COMMAND_STRUCTURE.example_text);
+        });
+
+        for (auto&& spec : specs)
+        {
+            Input::check_triplet(spec.package_spec.triplet(), paths);
+        }
+
+        const Build::BuildPackageOptions install_plan_options = {
+            Build::UseHeadVersion::NO,
+            Build::AllowDownloads::YES,
+            Build::OnlyDownloads::NO,
+            Build::CleanBuildtrees::YES,
+            Build::CleanPackages::YES,
+            Build::CleanDownloads::YES,
+            Build::DownloadTool::BUILT_IN,
+            GlobalState::g_binary_caching ? Build::BinaryCaching::YES : Build::BinaryCaching::NO,
+            Build::FailOnTombstone::NO,
+        };
+
+
+        PortFileProvider::PathsPortFileProvider provider(paths, args.overlay_ports.get());
+        auto cmake_vars = CMakeVars::make_triplet_cmake_var_provider(paths);
+
+        // We have a set of user-requested specs.
+        // We need to know all the specs which are required to fulfill dependencies for those specs.
+        // Therefore, we see what we would install into an empty installed tree, so we can use the existing code.
+        auto action_plan = Dependencies::create_feature_install_plan(provider, *cmake_vars, specs, {});
+
+        for (auto&& action : action_plan.install_actions)
+        {
+            action.build_options = install_plan_options;
+        }
+
+        cmake_vars->load_tag_vars(action_plan, provider);
+        Build::compute_all_abis(paths, action_plan, *cmake_vars, {});
+
+        std::set<std::string> all_abis;
+
+        for (const auto& action : action_plan.install_actions) {
+            all_abis.insert(action.package_abi.value_or_exit(VCPKG_LINE_INFO));
+        }
+
+        // currently (or once) installed specifications
+        auto status_db = database_load_check(paths);
+        std::vector<PackageSpec> specs_to_remove;
+        for (auto&& status_pgh : status_db)
+        {
+            if (!status_pgh->is_installed()) continue;
+            if (status_pgh->package.is_feature()) continue;
+
+            const auto& abi = status_pgh->package.abi;
+            if (abi.empty() || !Util::Sets::contains(all_abis, abi))
+            {
+                specs_to_remove.push_back(status_pgh->package.spec);
+            }
+        }
+
+        auto remove_plan = Dependencies::create_remove_plan(specs_to_remove, status_db);
+
+        for (const auto& action : remove_plan)
+        {
+            Remove::perform_remove_plan_action(paths, action, Remove::Purge::NO, &status_db);
+        }
+
+        auto real_action_plan = Dependencies::create_feature_install_plan(provider, *cmake_vars, specs, status_db);
+
+        for (auto& action : real_action_plan.install_actions)
+        {
+            action.build_options = install_plan_options;
+        }
+
+        Dependencies::print_plan(real_action_plan, true);
+
+        const auto summary = Install::perform(real_action_plan, Install::KeepGoing::NO, paths, status_db, *cmake_vars);
+
+        System::print2("\nTotal elapsed time: ", summary.total_elapsed_time, "\n\n");
+
+        Checks::exit_success(VCPKG_LINE_INFO);
+    }
+
+}
diff --git a/toolsrc/src/vcpkg/dependencies.cpp b/toolsrc/src/vcpkg/dependencies.cpp
index 07aad4d2209..120f84aefc6 100644
--- a/toolsrc/src/vcpkg/dependencies.cpp
+++ b/toolsrc/src/vcpkg/dependencies.cpp
@@ -560,7 +560,7 @@ namespace vcpkg::Dependencies
                                                      ? RequestType::USER_REQUESTED
                                                      : RequestType::AUTO_SELECTED;
 
-                auto maybe_ipv = status_db.find_all_installed(spec);
+                auto maybe_ipv = status_db.get_installed_package_view(spec);
 
                 if (auto p_ipv = maybe_ipv.get())
                 {
diff --git a/toolsrc/src/vcpkg/portfileprovider.cpp b/toolsrc/src/vcpkg/portfileprovider.cpp
index e43fa862a87..0b0ef4aaf19 100644
--- a/toolsrc/src/vcpkg/portfileprovider.cpp
+++ b/toolsrc/src/vcpkg/portfileprovider.cpp
@@ -34,7 +34,7 @@ namespace vcpkg::PortFileProvider
             {
                 if (!overlay_path.empty())
                 {
-                    auto overlay = fs::stdfs::canonical(fs::u8path(overlay_path));
+                    auto overlay = fs.canonical(VCPKG_LINE_INFO, fs::u8path(overlay_path));
 
                     Checks::check_exit(VCPKG_LINE_INFO,
                                        filesystem.exists(overlay),
diff --git a/toolsrc/src/vcpkg/remove.cpp b/toolsrc/src/vcpkg/remove.cpp
index e1a03b80894..bb25cd21d77 100644
--- a/toolsrc/src/vcpkg/remove.cpp
+++ b/toolsrc/src/vcpkg/remove.cpp
@@ -21,7 +21,7 @@ namespace vcpkg::Remove
     void remove_package(const VcpkgPaths& paths, const PackageSpec& spec, StatusParagraphs* status_db)
     {
         auto& fs = paths.get_filesystem();
-        auto maybe_ipv = status_db->find_all_installed(spec);
+        auto maybe_ipv = status_db->get_installed_package_view(spec);
 
         Checks::check_exit(
             VCPKG_LINE_INFO, maybe_ipv.has_value(), "unable to remove package %s: already removed", spec);
@@ -72,6 +72,7 @@ namespace vcpkg::Remove
                     fs.remove(target, ec);
                     if (ec)
                     {
+                        // TODO: this is racy; should we ignore this error?
 #if defined(_WIN32)
                         fs::stdfs::permissions(target, fs::perms::owner_all | fs::perms::group_all, ec);
                         fs.remove(target, ec);
diff --git a/toolsrc/src/vcpkg/statusparagraphs.cpp b/toolsrc/src/vcpkg/statusparagraphs.cpp
index 2621c43e311..91058a473dc 100644
--- a/toolsrc/src/vcpkg/statusparagraphs.cpp
+++ b/toolsrc/src/vcpkg/statusparagraphs.cpp
@@ -18,16 +18,16 @@ namespace vcpkg
         {
             if (p->package.spec.name() == name && p->package.spec.triplet() == triplet)
             {
-                if (p->package.feature.empty())
-                    spghs.emplace(spghs.begin(), &p);
-                else
+                if (p->package.is_feature())
                     spghs.emplace_back(&p);
+                else
+                    spghs.emplace(spghs.begin(), &p);
             }
         }
         return spghs;
     }
 
-    Optional<InstalledPackageView> StatusParagraphs::find_all_installed(const PackageSpec& spec) const
+    Optional<InstalledPackageView> StatusParagraphs::get_installed_package_view(const PackageSpec& spec) const
     {
         InstalledPackageView ipv;
         for (auto&& p : *this)
@@ -35,13 +35,12 @@ namespace vcpkg
             if (p->package.spec.name() == spec.name() && p->package.spec.triplet() == spec.triplet() &&
                 p->is_installed())
             {
-                if (p->package.feature.empty())
-                {
+                if (p->package.is_feature()) {
+                    ipv.features.emplace_back(p.get());
+                } else {
                     Checks::check_exit(VCPKG_LINE_INFO, ipv.core == nullptr);
                     ipv.core = p.get();
                 }
-                else
-                    ipv.features.emplace_back(p.get());
             }
         }
         if (ipv.core != nullptr)
diff --git a/toolsrc/src/vcpkg/vcpkgcmdarguments.cpp b/toolsrc/src/vcpkg/vcpkgcmdarguments.cpp
index 46e4c86ea95..d8deae566a6 100644
--- a/toolsrc/src/vcpkg/vcpkgcmdarguments.cpp
+++ b/toolsrc/src/vcpkg/vcpkgcmdarguments.cpp
@@ -152,6 +152,12 @@ namespace vcpkg
                         arg.substr(sizeof("--x-scripts-root=") - 1), "--x-scripts-root", args.scripts_root_dir);
                     continue;
                 }
+                if (Strings::starts_with(arg, "--x-install-root="))
+                {
+                    parse_cojoined_value(
+                        arg.substr(sizeof("--x-install-root=") - 1), "--x-install-root=", args.install_root_dir);
+                    continue;
+                }
                 if (arg == "--triplet")
                 {
                     ++arg_begin;
diff --git a/toolsrc/src/vcpkg/vcpkglib.cpp b/toolsrc/src/vcpkg/vcpkglib.cpp
index 2a52111a651..366e2aa850c 100644
--- a/toolsrc/src/vcpkg/vcpkglib.cpp
+++ b/toolsrc/src/vcpkg/vcpkglib.cpp
@@ -178,7 +178,7 @@ namespace vcpkg
         {
             if (!pgh->is_installed()) continue;
             auto& ipv = ipv_map[pgh->package.spec];
-            if (pgh->package.feature.empty())
+            if (!pgh->package.is_feature())
             {
                 ipv.core = pgh.get();
             }
@@ -206,7 +206,7 @@ namespace vcpkg
 
         for (const std::unique_ptr<StatusParagraph>& pgh : status_db)
         {
-            if (!pgh->is_installed() || !pgh->package.feature.empty())
+            if (!pgh->is_installed() || pgh->package.is_feature())
             {
                 continue;
             }
diff --git a/toolsrc/src/vcpkg/vcpkgpaths.cpp b/toolsrc/src/vcpkg/vcpkgpaths.cpp
index bf16f09f3fd..52dd06b7bce 100644
--- a/toolsrc/src/vcpkg/vcpkgpaths.cpp
+++ b/toolsrc/src/vcpkg/vcpkgpaths.cpp
@@ -14,6 +14,7 @@
 namespace vcpkg
 {
     Expected<VcpkgPaths> VcpkgPaths::create(const fs::path& vcpkg_root_dir,
+                                            const Optional<fs::path>& install_root_dir,
                                             const Optional<fs::path>& vcpkg_scripts_root_dir,
                                             const std::string& default_vs_path,
                                             const std::vector<std::string>* triplets_dirs)
@@ -53,7 +54,7 @@ namespace vcpkg
                     asPath.u8string());
             }
 
-            paths.downloads = fs::stdfs::canonical(std::move(asPath), ec);
+            paths.downloads = fs.canonical(std::move(asPath), ec);
             if (ec)
             {
                 return ec;
@@ -65,13 +66,17 @@ namespace vcpkg
         }
 
         paths.ports = paths.root / "ports";
-        paths.installed = paths.root / "installed";
+        if (auto d = install_root_dir.get()) {
+            paths.installed = fs.absolute(VCPKG_LINE_INFO, std::move(*d));
+        } else {
+            paths.installed = paths.root / "installed";
+        }
         paths.triplets = paths.root / "triplets";
         paths.community_triplets = paths.triplets / "community";
 
         if (auto scripts_dir = vcpkg_scripts_root_dir.get())
         {
-            if (scripts_dir->empty() || !fs::stdfs::is_directory(*scripts_dir))
+            if (scripts_dir->empty() || !fs::is_directory(fs.status(VCPKG_LINE_INFO, *scripts_dir)))
             {
                 Metrics::g_metrics.lock()->track_property("error", "Invalid scripts override directory.");
                 Checks::exit_with_message(
@@ -108,11 +113,11 @@ namespace vcpkg
                                    paths.get_filesystem().exists(path),
                                    "Error: Path does not exist '%s'",
                                    triplets_dir);
-                paths.triplets_dirs.emplace_back(fs::stdfs::canonical(path));
+                paths.triplets_dirs.emplace_back(fs.canonical(VCPKG_LINE_INFO, path));
             }
         }
-        paths.triplets_dirs.emplace_back(fs::stdfs::canonical(paths.triplets));
-        paths.triplets_dirs.emplace_back(fs::stdfs::canonical(paths.community_triplets));
+        paths.triplets_dirs.emplace_back(fs.canonical(VCPKG_LINE_INFO, paths.triplets));
+        paths.triplets_dirs.emplace_back(fs.canonical(VCPKG_LINE_INFO, paths.community_triplets));
 
         return paths;
     }
diff --git a/toolsrc/vcpkglib/vcpkglib.vcxproj b/toolsrc/vcpkglib/vcpkglib.vcxproj
index ed80a210e88..f054fe1ad20 100644
--- a/toolsrc/vcpkglib/vcpkglib.vcxproj
+++ b/toolsrc/vcpkglib/vcpkglib.vcxproj
@@ -253,6 +253,7 @@
     <ClCompile Include="..\src\vcpkg\commands.porthistory.cpp" />
     <ClCompile Include="..\src\vcpkg\commands.portsdiff.cpp" />
     <ClCompile Include="..\src\vcpkg\commands.search.cpp" />
+    <ClCompile Include="..\src\vcpkg\commands.setinstalled.cpp" />
     <ClCompile Include="..\src\vcpkg\commands.upgrade.cpp" />
     <ClCompile Include="..\src\vcpkg\commands.version.cpp" />
     <ClCompile Include="..\src\vcpkg\commands.xvsinstances.cpp" />
diff --git a/toolsrc/vcpkglib/vcpkglib.vcxproj.filters b/toolsrc/vcpkglib/vcpkglib.vcxproj.filters
index 4e2bbb45a9d..e9441f72cf3 100644
--- a/toolsrc/vcpkglib/vcpkglib.vcxproj.filters
+++ b/toolsrc/vcpkglib/vcpkglib.vcxproj.filters
@@ -87,6 +87,9 @@
     <ClCompile Include="..\src\vcpkg\commands.search.cpp">
       <Filter>Source Files\vcpkg</Filter>
     </ClCompile>
+    <ClCompile Include="..\src\vcpkg\commands.setinstalled.cpp">
+      <Filter>Source Files\vcpkg</Filter>
+    </ClCompile>
     <ClCompile Include="..\src\vcpkg\commands.version.cpp">
       <Filter>Source Files\vcpkg</Filter>
     </ClCompile>
@@ -441,4 +444,4 @@
       <Filter>Header Files\vcpkg</Filter>
     </ClInclude>
   </ItemGroup>
-</Project>
\ No newline at end of file
+</Project>