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FILExt.com is the file extension source. Here you

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Thousands of file extensions with detailed information about each file type, including a list of programs that open the files.

Downloadatoz.com offers complete common file extensions list with detailed information about each file extensions and the programs that open the file format.

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Advanced File Fixer is the industry-leading Windows file fixer that enables you instantly to fix all types of broken or unknown file extensions. Learn more.

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Dotwhat.net is a file extension resource website containing detailed information on a huge number of file extensions, such as the software used to create and open files.