REFERENCE DESK
Find the cause. Keep your file private.
Start with the symptom. These checks do not need your filename or package contents.
Reviewed October 19, 2026 · PreviewAll formats
Unknown signature / wrong extension
Check the source format. PS4 CNT, PS3 PKG and macOS XAR are different containers. Renaming a file will not convert it. This inspector supports the PS4 signature and XAR header detection only.
Before trying again
Keep your original file. Confirm it is fully present on disk, then select it again. This inspector never repairs or changes package bytes. If header results are available, export the JSON locally and read the warnings before sharing it.
A readable header is a limited result
The signature and declared ranges are structural checks. This release does not verify cryptographic hashes, signatures, publisher authenticity or installability.
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