File Extension Truth Checker 1.0.0

The first public release of File Extension Truth Checker.

It compares a file's extension with content signatures and structured-text evidence, including ZIP-based subformats such as DOCX, XLSX, PPTX, EPUB, and common archive or media formats. Results explain what was detected and whether the name is trustworthy, suspicious, or unknown.

The checker is read-only and never uploads files.