HRESULT 0xC00D1018 (NS_E_WMPZIP_NOTAZIPFILE): meaning and diagnosis

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Description:

The ZIP reader opened a file and its signature did not match that of the ZIP files.%0

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NS_E_WMP_CS_NOTEVENLYDIVISIBLE	NS_E_WMPZIP_CORRUPT

NS_E_WMPZIP_NOTAZIPFILE

What `NS_E_WMPZIP_NOTAZIPFILE` means

NS_E_WMPZIP_NOTAZIPFILE is returned by the Windows Media Player skin-package loader when the file selected as a skin ZIP package is not recognized as a ZIP archive. A .zip or skin-related filename is not enough: the bytes presented to the ZIP reader must contain a valid archive structure.

This result is narrower than a generic media-file error. The failing object is the package used by the Player skin loader, before the loader can resolve the .wms definition and its image, script, or other resource members.

What to check first

Record the exact package path, file size, modification time, and a hash of the bytes that reached the Player.
Open the same file with a ZIP-aware inspection tool and verify that it is actually an archive rather than an HTML error page, text file, truncated download, or another format renamed with a ZIP-like extension.
If the package came from a download or updater, compare the received size and hash with the source artifact before repacking anything.
Keep the original failing file. Recreating or renaming it before inspection destroys the evidence that distinguishes a wrong file from a damaged archive.

Nearby Windows Media ZIP results

Result	Different condition
`NS_E_WMPZIP_CORRUPT`	A ZIP package was recognized, but its archive structure or a member fails an integrity/structure check.
`NS_E_WMPZIP_FILENOTFOUND`	The ZIP package opened, but a resource referenced by the skin is absent from the archive.

This distinction matters during repair. Renaming a non-ZIP file cannot make it a valid skin package, while rebuilding a genuinely damaged ZIP and fixing a missing member are different operations.

Verification after correction

Repeat the original skin-loading operation with the corrected package. The result is resolved only when Windows Media Player opens the archive and advances to the next package stage. If XML, resource, image, or script validation then fails with another HRESULT, preserve that later result separately rather than treating it as recurrence of NS_E_WMPZIP_NOTAZIPFILE.

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