Viewing Extensions

File extensions are the last three letters of a filename that are  used to indicate the type of data that is stored in the file. Compass files have file extensions like DAT, MAK, CLP, BAK etc. As an example, here is an example of data file: "GROAN.DAT"

Under Windows, you have the options of hiding or displaying these extensions. To fix these "data saving" problems, it is important to see the extensions of each file. For this reason, you should make sure that Windows displays all file extensions. To do this, go into Windows Explorer or My Computer and select the "View" and then "Folder Options" from the menu bar. At the top of the page, select the "View" tab and then make sure the "Hide file extensions for known files types" option is not checked