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APPX_E_FILE_COMPRESSION_MISMATCH
APPX_E_FILE_COMPRESSION_MISMATCH means that a file has different compression state in the baseline package and the package used for the update. This breaks the assumptions required for the delta or update operation.
How to prevent it
- Keep compression settings stable across baseline and update builds that will use delta servicing.
- Check packaging-tool versions and command-line options for changes that alter compression behavior.
- Rebuild the update or use a full package when a compatible delta cannot be created.
Changing application files intentionally is normal; changing their packaging compression state can invalidate a delta relationship.
Microsoft: troubleshoot Windows app packages
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