HEATKEYS

This site contains a searchable database of thousands of file extensions, with information about the most common Windows applications used to open them.

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FILExt.com is the file extension source. Here you

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An online computer dictionary and internet search engine for internet terms and technical support.

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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.

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Find which Windows software can open a file with specified extension

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DataTypes.net is a constantly expanded database about filename extensions, the file types and applications related to them.