Files that contain the .bis file extension are files that have been created with the BeInSync software application.
BeInSync is a marketing and synchronization software that saves copies of the files that are located on your server and adds the .bis file extension to the files that are saved with the program. For example, if you have a Word file with the file name document.doc on your server or computer, BeInSync would save the file backed up file as document.doc.bis.
This software allows a user to synchronize the files on their server or computer with hard drives of other computers and/or mobile devices.
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If you have additional information about the BIS file format or software that uses files with the BIS suffix, please do get in touch - we would love hearing from you.