What is the CIS file format?
A file with the .CIS extension is a file known as CheckInbox. It belongs to the Misc Files category. This format is associated with VicTech Software.
The reliable way to open a .CIS 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 .CIS 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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