Fix quicklook appex build (#27144)

src/MacAppBundle/QuickLook/CMakeLists.txt

@@ -49,8 +49,12 @@ if(FREECAD_QUICKLOOK_MODERN_SUPPORT)
 endif()
 
 if(FREECAD_QUICKLOOK_LEGACY_SUPPORT)
-    set(BUILD_LEGACY_GENERATOR ON)
-    message(STATUS "Building legacy .qlgenerator QuickLook support")
+    if(CMAKE_OSX_DEPLOYMENT_TARGET VERSION_LESS "15.0")
+        set(BUILD_LEGACY_GENERATOR ON)
+        message(STATUS "Building legacy .qlgenerator QuickLook support")
+    else()
+        message(STATUS "Skipping legacy .qlgenerator (not needed for macOS 15.0+)")
+    endif()
 endif()
 
 if(NOT BUILD_MODERN_EXTENSIONS AND NOT BUILD_LEGACY_GENERATOR)

src/MacAppBundle/QuickLook/legacy/CMakeLists.txt

@@ -10,10 +10,10 @@ cmake_minimum_required(VERSION 3.22)
 set(TARGET_APP_BUNDLE "${CMAKE_BINARY_DIR}/src/MacAppBundle/FreeCAD.app")
 set(LEGACY_QUICKLOOK_DIR "${TARGET_APP_BUNDLE}/Contents/Library/QuickLook")
 
-# Build legacy QuickLook generator using traditional CMake approach
+# Build legacy QuickLook generator as a proper macOS plugin bundle
 add_library(
     QuicklookFCStd
-    SHARED
+    MODULE
     GeneratePreviewForURL.m
     GenerateThumbnailForURL.m
     main.c
@@ -22,8 +22,9 @@ add_library(
 set_target_properties(
     QuicklookFCStd
     PROPERTIES
-    FRAMEWORK TRUE
-    MACOSX_FRAMEWORK_INFO_PLIST "${CMAKE_CURRENT_SOURCE_DIR}/QuicklookFCStd.qlgenerator/Contents/Info.plist"
+    BUNDLE TRUE
+    BUNDLE_EXTENSION "qlgenerator"
+    MACOSX_BUNDLE_INFO_PLIST "${CMAKE_CURRENT_SOURCE_DIR}/QuicklookFCStd.qlgenerator/Contents/Info.plist"
 )
 
 target_link_libraries(