File Extension CIS

.CIS File

File extension: CIS
File type: CheckInbox File


Notes about the CIS file extension:



To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened" (Windows 7) or "How do you want to open this file?" (Windows 10) if you double-click the file. There click on "More apps" and choose a suitable software to view such files on your PC or from email attachments.

The CIS file type is primarily associated with 'CheckInbox File'.

Detailed information for file extension CIS:


Primary association: CheckInbox File

Other applications associated with file type CIS:

  • TAPCIS (Parameter/Address Book/Rates File)TAPCIS is a DOS-based access program for the CompuServe Information Service. The program dates from the 1983 timeframe where it started as an interpreted BASIC program and later became a standalone program. The program was written and supported by Howard Benner and OMNI Information Resources, Inc. as well as Support Group, Inc. of McHenry, MD.



To change file associations press Windows Key + X and then Apps and Features > Default apps > Choose default apps by file type. Invalid file associations could be the result of underlying issues within your Windows PC.

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