diff --git a/cmake/ModSDK.cmake b/cmake/ModSDK.cmake
index 0371a7d61b..10a87e8525 100644
--- a/cmake/ModSDK.cmake
+++ b/cmake/ModSDK.cmake
@@ -13,6 +13,18 @@ function(_mod_lib_info out_platform_var out_name_var)
             message(FATAL_ERROR "add_mod: universal binaries are not supported")
         endif ()
         set(_arch "${CMAKE_OSX_ARCHITECTURES}")
+    elseif (WIN32)
+        set(_arch_id "${CMAKE_CXX_COMPILER_ARCHITECTURE_ID}")
+        if (NOT _arch_id)
+            set(_arch_id "${CMAKE_C_COMPILER_ARCHITECTURE_ID}")
+        endif ()
+        if (_arch_id MATCHES "^ARM64(EC)?$")
+            set(_arch "arm64")
+        elseif (_arch_id STREQUAL "x64")
+            set(_arch "amd64")
+        elseif (_arch_id STREQUAL "X86")
+            set(_arch "x86")
+        endif ()
     endif ()
     string(TOLOWER "${CMAKE_SYSTEM_NAME}" _platform)
     if (_platform STREQUAL "darwin")
@@ -74,7 +86,15 @@ function(_mod_collect_assets out_var dir)
     endif ()
 
     file(GLOB_RECURSE _files CONFIGURE_DEPENDS LIST_DIRECTORIES false "${dir}/*")
-    set(${out_var} ${_files} PARENT_SCOPE)
+    # Dotfiles (.gitkeep, .DS_Store, ...) are not packaged; see CopyModAssets.cmake.
+    set(_assets "")
+    foreach (_file IN LISTS _files)
+        file(RELATIVE_PATH _rel "${dir}" "${_file}")
+        if (NOT _rel MATCHES "(^|/)\\.")
+            list(APPEND _assets "${_file}")
+        endif ()
+    endforeach ()
+    set(${out_var} ${_assets} PARENT_SCOPE)
 endfunction()
 
 function(_mod_add_webgpu_headers target_name)
@@ -290,8 +310,8 @@ function(add_mod target_name)
         list(APPEND _package_deps ${_res_deps})
         list(APPEND _package_inputs "${_res_dir}" ${_res_deps})
         list(APPEND _zip_args res)
-        list(APPEND _extra_cmds COMMAND ${CMAKE_COMMAND} -E copy_directory
-                "${_res_dir}" "${_stage}/res")
+        list(APPEND _extra_cmds COMMAND ${CMAKE_COMMAND} "-DSRC=${_res_dir}"
+                "-DDST=${_stage}/res" -P "${CMAKE_CURRENT_FUNCTION_LIST_DIR}/CopyModAssets.cmake")
     endif ()
     if (ARG_OVERLAY_DIR)
         _mod_resolve_source_path(_overlay_dir "${ARG_OVERLAY_DIR}")
@@ -299,8 +319,8 @@ function(add_mod target_name)
         list(APPEND _package_deps ${_overlay_deps})
         list(APPEND _package_inputs "${_overlay_dir}" ${_overlay_deps})
         list(APPEND _zip_args overlay)
-        list(APPEND _extra_cmds COMMAND ${CMAKE_COMMAND} -E copy_directory
-                "${_overlay_dir}" "${_stage}/overlay")
+        list(APPEND _extra_cmds COMMAND ${CMAKE_COMMAND} "-DSRC=${_overlay_dir}"
+                "-DDST=${_stage}/overlay" -P "${CMAKE_CURRENT_FUNCTION_LIST_DIR}/CopyModAssets.cmake")
     endif ()
     if (ARG_TEXTURES_DIR)
         _mod_resolve_source_path(_textures_dir "${ARG_TEXTURES_DIR}")
@@ -308,8 +328,8 @@ function(add_mod target_name)
         list(APPEND _package_deps ${_textures_deps})
         list(APPEND _package_inputs "${_textures_dir}" ${_textures_deps})
         list(APPEND _zip_args textures)
-        list(APPEND _extra_cmds COMMAND ${CMAKE_COMMAND} -E copy_directory
-                "${_textures_dir}" "${_stage}/textures")
+        list(APPEND _extra_cmds COMMAND ${CMAKE_COMMAND} "-DSRC=${_textures_dir}"
+                "-DDST=${_stage}/textures" -P "${CMAKE_CURRENT_FUNCTION_LIST_DIR}/CopyModAssets.cmake")
     endif ()
 
     set(_bundle_cmds "")