What is the THNL file format?
A file with the .THNL extension is a file known as Graphics Workshop For Windows Thumbnail. This format is associated with Alchemy Mindworks.
The reliable way to open a .THNL file is with software that recognises this exact format, rather than guessing from the file name. If you are not sure what created a file, our file identifier can read its first bytes and name the real format, even when the file has been renamed.
We are still gathering the list of programs that open .THNL files. A fully verified, hand-written description of this format is being prepared; until then, the details on this page are drawn directly from our database.
Format details
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