GeezerVison is showing github.com — gh-160624: Stop embedding a manifest in Windows DLLs and extension modules by mkanat · Pull Request #160626 · python/cpython
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mkanat
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Oct 24, 2026
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The way that CPython compiles DLLs for Windows causes an unnecessary problem with long paths (#160624).
This removes the manifest, and the RT_MANIFEST fallback define that only it used, from PC/python_nt.rc and PC/sqlite3.rc. That covers python3XY.dll, python3.dll, sqlite3.dll, and every extension module. python.exe, pythonw.exe, and the launchers keep theirs.
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…ion modules
Windows can't load a DLL with an embedded manifest from a path near
MAX_PATH, even with long paths enabled, so python.exe failed to start
from long paths. The manifest has no effect in a DLL. The executables
keep theirs.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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This also should be backported to all stable branches, most likely.
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