.CIS File

The cis file extension is associated with the CheckInbox, a tool for Microsoft Windows operating system that allows users to checks multiple POP3 email accounts.

The cis file contains some kind of data used by CheckInbox.

A cis file extension is related to the CheckInbox a tool for check e-mail accounts.

How to open:

The *.cis files are for internal purposes of CheckInbox.

How to convert:

Probably cannot be converted to anything else.