diff --git a/.github/workflows/build_orca.yml b/.github/workflows/build_orca.yml
index fc406b09d5f..0bc2c37a204 100644
--- a/.github/workflows/build_orca.yml
+++ b/.github/workflows/build_orca.yml
@@ -315,7 +315,7 @@ jobs:
             "ARCH_SUFFIX=_arm64"     | Out-File -Append -FilePath $env:GITHUB_ENV -Encoding utf8
           } else {
             "BUILD_DIR=build"        | Out-File -Append -FilePath $env:GITHUB_ENV -Encoding utf8
-            "ARCH_SUFFIX="           | Out-File -Append -FilePath $env:GITHUB_ENV -Encoding utf8
+            "ARCH_SUFFIX=_x64"       | Out-File -Append -FilePath $env:GITHUB_ENV -Encoding utf8
           }
 
       - name: setup MSVC
@@ -405,7 +405,7 @@ jobs:
         with:
           upload_url: https://uploads.github.com/repos/OrcaSlicer/OrcaSlicer/releases/137995723/assets{?name,label}
           release_id: 137995723
-          asset_path: ${{ github.workspace }}/${{ env.BUILD_DIR }}/OrcaSlicer_Windows_Installer_${{ env.ver }}.exe
+          asset_path: ${{ github.workspace }}/${{ env.BUILD_DIR }}/OrcaSlicer_Windows_Installer_${{ env.ver }}${{ env.ARCH_SUFFIX }}.exe
           asset_name: OrcaSlicer_Windows_Installer${{ env.ARCH_SUFFIX }}_nightly${{ env.nightly_suffix }}.exe
           asset_content_type: application/x-msdownload
           max_releases: 1
diff --git a/.github/workflows/publish_release.yml b/.github/workflows/publish_release.yml
index 70a89ecbbd8..60d68e2459d 100644
--- a/.github/workflows/publish_release.yml
+++ b/.github/workflows/publish_release.yml
@@ -92,9 +92,11 @@ jobs:
           # binaries are already unzipped. Copy the inner binary for each platform.
           # -type f is required (some artifact *folders* are named "*.flatpak").
 
-          # Windows installer: the .exe inside the installer artifact, NOT the
-          # orca-slicer.exe that lives in the portable app folder.
-          find artifacts -type f -name '*.exe' -path '*OrcaSlicer_Windows_*' ! -path '*_portable*' -exec cp -v {} upload/ \;
+          # Windows installers (x64 + arm64): the .exe inside each installer
+          # artifact, NOT the orca-slicer.exe in the portable app folder. CPack
+          # now bakes the arch into the filename (…_x64.exe / …_arm64.exe), so
+          # copy them straight through.
+          find artifacts -type f -name '*.exe' -path '*OrcaSlicer_Windows_V*' ! -path '*_portable*' -exec cp -v {} upload/ \;
           # macOS universal DMG (profile-validator DMG isn't downloaded).
           find artifacts -type f -name '*.dmg' -path '*OrcaSlicer_Mac_universal_*' -exec cp -v {} upload/ \;
           # Linux AppImage.
@@ -104,15 +106,16 @@ jobs:
           # Windows debug symbols (PDB archive, for developers).
           find artifacts -type f -name 'Debug_PDB_*.7z' -exec cp -v {} upload/ \;
 
-          # Portable Windows build is an unzipped folder artifact; re-zip it to the
-          # released filename (this one stays a .zip on the release).
-          portable_dir=$(find artifacts -maxdepth 1 -type d -name 'OrcaSlicer_Windows_*_portable' | head -n1)
-          if [ -n "${portable_dir:-}" ]; then
-            ( cd "$portable_dir" && zip -qr "$GITHUB_WORKSPACE/upload/$(basename "$portable_dir").zip" . )
-            echo "Zipped portable -> $(basename "$portable_dir").zip"
-          else
+          # Portable Windows builds (x64 + arm64) are unzipped folder artifacts;
+          # re-zip each to its released filename (these stay .zip on the release).
+          mapfile -t portable_dirs < <(find artifacts -maxdepth 1 -type d -name 'OrcaSlicer_Windows_*_portable')
+          if [ ${#portable_dirs[@]} -eq 0 ]; then
             echo "::warning::Windows portable artifact not found."
           fi
+          for portable_dir in "${portable_dirs[@]}"; do
+            ( cd "$portable_dir" && zip -qr "$GITHUB_WORKSPACE/upload/$(basename "$portable_dir").zip" . )
+            echo "Zipped portable -> $(basename "$portable_dir").zip"
+          done
 
           echo "Assets to upload:"
           ls -lh upload
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e24e296ad41..8dcd4cf0040 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -934,6 +934,16 @@ set (CPACK_PACKAGE_VERSION_MAJOR "${ORCA_VERSION_MAJOR}")
 set (CPACK_PACKAGE_VERSION_MINOR "${ORCA_VERSION_MINOR}")
 set (CPACK_PACKAGE_VERSION_PATCH "${ORCA_VERSION_PATCH}")
 set (CPACK_PACKAGE_FILE_NAME "OrcaSlicer_Windows_Installer_V${SoftFever_VERSION}")
+# Suffix the Windows installer with its target arch so the x64 and arm64 builds
+# produce distinct filenames (matches ARCH_SUFFIX in build_orca.yml). Same
+# CMAKE_SYSTEM_PROCESSOR mapping used by orcaslicer_copy_dlls() above.
+if (WIN32)
+    if (CMAKE_SYSTEM_PROCESSOR STREQUAL "ARM64")
+        string (APPEND CPACK_PACKAGE_FILE_NAME "_arm64")
+    else ()
+        string (APPEND CPACK_PACKAGE_FILE_NAME "_x64")
+    endif ()
+endif ()
 set (CPACK_PACKAGE_DESCRIPTION_SUMMARY "Orca Slicer is an open source slicer for FDM printers")
 set (CPACK_PACKAGE_HOMEPAGE_URL "https://github.com/OrcaSlicer/OrcaSlicer")
 set (CPACK_PACKAGE_INSTALL_DIRECTORY ${CPACK_PACKAGE_NAME})