diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 65c4efb3..8ec8af5d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -129,16 +129,28 @@ jobs:
   build_for_macos:
     name: macOS 11
     runs-on: macos-11
-    env:
-      install_name: "sfizz-${{ github.ref_name }}-macos"
     steps:
+    - name: Update bash
+      run: brew install bash
+    - name: Set install_name
+      run: |
+        ghref=${{ github.ref_name }}
+        echo "install_name=sfizz-${ghref//'/'/'-'}-macos" >> "$GITHUB_ENV"
+    - name: Show summary
+      run: |
+        echo "install_name: ${{ env.install_name }}"
+        echo "BASH_VERSION: $BASH_VERSION"
+        system_profiler SPSoftwareDataType
+        cmake --version
+        gcc -v
+        xcodebuild -version
+    - name: Install dependencies
+      if: ${{ github.ref_type == 'branch' }}
+      run: brew install abseil
     - name: Checkout
       uses: actions/checkout@v3
       with:
         submodules: recursive
-    - name: Install dependencies
-      if: ${{ github.ref_type == 'branch' }}
-      run: brew install abseil
     - name: Configure CMake
       run: |
         options=(
@@ -188,10 +200,10 @@ jobs:
         sudo killall -9 AudioComponentRegistrar
         auval -v aumu samp Sfzt
     - name: Package bundles
-      if: ${{ github.ref_type == 'tag' }}
+      if: github.ref_type == 'tag' || github.event_name == 'pull_request'
       run: ./scripts/package-osx-bundles.sh
     - name: Create installer
-      if: ${{ github.ref_type == 'tag' }}
+      if: github.ref_type == 'tag' || github.event_name == 'pull_request'
       working-directory: ${{ github.workspace }}/build
       run: |
         options=(
@@ -203,7 +215,7 @@ jobs:
         )
         productbuild "${options[@]}"
     - name: Upload
-      if: ${{ github.ref_type == 'tag' }}
+      if: github.ref_type == 'tag' || github.event_name == 'pull_request'
       uses: actions/upload-artifact@v3
       with:
         name: macOS package
@@ -223,9 +235,14 @@ jobs:
           pkg_platform: Win64
           release_arch: x64
           bits: 64
-    env:
-      install_name: sfizz-${{ github.ref_name }}-win${{ matrix.bits }}
     steps:
+    - name: Set install name
+      run: |
+        $stripped_name="${{ github.ref_name }}".replace('/', '-')
+        echo "install_name=sfizz-$stripped_name-win${{ matrix.bits }}" >> "${env:GITHUB_ENV}"
+    - name: Show summary
+      run: |
+        echo "install_name: $env:install_name"
     - name: Checkout
       uses: actions/checkout@v3
       with:
@@ -267,11 +284,11 @@ jobs:
       working-directory: ${{ github.workspace }}/build
       run: pluginval --validate-in-process --validate sfizz.vst3
     - name: Create installer
-      if: ${{ github.ref_type == 'tag' }}
+      if: github.ref_type == 'tag' || github.event_name == 'pull_request'
       working-directory: ${{ github.workspace }}/build
       run: iscc /O"." /F"${{ env.install_name }}" /dARCH="${{ matrix.platform }}" innosetup.iss
     - name: Upload
-      if: ${{ github.ref_type == 'tag' }}
+      if: github.ref_type == 'tag' || github.event_name == 'pull_request'
       uses: actions/upload-artifact@v3
       with:
         name: ${{ matrix.pkg_platform }} installer
diff --git a/plugins/common/plugin/FileTrie.cpp b/plugins/common/plugin/FileTrie.cpp
index 014ad626..31c77a04 100644
--- a/plugins/common/plugin/FileTrie.cpp
+++ b/plugins/common/plugin/FileTrie.cpp
@@ -97,6 +97,10 @@ size_t FileTrieBuilder::ensureDirectory(const fs::path& dirPath)
         fs::path parentPath = dirPath.parent_path();
         if (parentPath != dirPath)
             ent.parent = ensureDirectory(parentPath);
+        else
+            // On Windows, (--dirPath.end()) would be `\\` but `parent_path` and `dirPath`
+            // would both be `C:\\` so we update the name to match.
+            ent.name = dirPath.u8string();
     }
 
     size_t dirIndex = trie.entries_.size();
diff --git a/plugins/common/plugin/SfizzFileScan.cpp b/plugins/common/plugin/SfizzFileScan.cpp
index 66fbe723..aa3d773f 100644
--- a/plugins/common/plugin/SfizzFileScan.cpp
+++ b/plugins/common/plugin/SfizzFileScan.cpp
@@ -34,7 +34,18 @@ bool SfzFileScan::locateRealFile(const fs::path& pathOrig, fs::path& pathFound)
     std::unique_lock<std::mutex> lock { mutex };
     refreshScan();
 
-    auto it = file_index_.find(keyOf(pathOrig.filename()));
+    const auto key = [&] {
+        auto path = pathOrig.string();
+        if (path.size() > 3 && path[1] == ':' && path[2] == '\\') {
+            // Assume an absolute windows path and switch anti-slashes to slashes
+            std::replace(path.begin(), path.end(), '\\', '/');
+            return keyOf(fs::path(path).filename());
+        }
+
+        return keyOf(pathOrig.filename());
+    }();
+
+    auto it = file_index_.find(key);
     if (it == file_index_.end())
         return false;