diff --git a/mlir/lib/Bindings/Python/CMakeLists.txt b/mlir/lib/Bindings/Python/CMakeLists.txt
--- a/mlir/lib/Bindings/Python/CMakeLists.txt
+++ b/mlir/lib/Bindings/Python/CMakeLists.txt
@@ -79,7 +79,8 @@
 
 # Note that we copy from the source tree just like for headers because
 # it will not be polluted with py_cache runtime artifacts (from testing and
-# such).
+# such). Note that Windows has trouble installing symlinks, which makes it
+# necessary to install these from the source tree.
 install(
   DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/mlir
   DESTINATION python
@@ -94,14 +95,13 @@
     COMPONENT MLIRBindingsPythonSources)
 endif()
 
-# Dialect sources are generated. Install separately.
-# Note that __pycache__ directories may have been left by tests and other
-# executions. And __init__.py is handled as a regular source file.
+# Install generated dialect sources, all of which have the same file name
+# pattern (and must not match any source file patterns).
 install(
   DIRECTORY ${PROJECT_BINARY_DIR}/python/mlir/dialects
   DESTINATION python/mlir
   COMPONENT MLIRBindingsPythonDialects
-  FILES_MATCHING PATTERN "*.py"
+  FILES_MATCHING PATTERN "_*_gen.py"
   PATTERN "__pycache__" EXCLUDE
   PATTERN "__init__.py" EXCLUDE
 )