What is the CH1 file format?
A file with the .CH1 extension is a file known as IBM Freelance Graphics Chart. This format is associated with IBM.
The reliable way to open a .CH1 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 .CH1 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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