FileProInfo.com is the file information database of over 15,000+ file types, software, free online apps/tools, so tools, guest blogs, videos, and images.
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Convertio - File Conversion in the Cloud
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FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.
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File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.