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Common File Extensions - FileInfo.com
PHP: filetype - Manual
FileInfo.com - The File Format Database
List of file formats - Wikipedia
File Type Definition - What is a file type? - TechTerms.com
File format - Wikipedia
Blob.type property - Web APIs | MDN - MDN Web Docs
File types indexable by Google - Google Developers
How to check type of files without extensions? - Stack Overflow
What is the difference between File Type and File Format?
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