Even in a windows browser, you should see different file icons for Cimatron parts, drawings, assemblies etc.

When this ability breaks, all Cimatron files share the same generic icon.  The problem stems from the windows registry of the PC,  there is a key within the Hkey_classes_root main key that has to repaired.
The simple fix is to download this small executable.

Extract the contents and rename the .ex_ to .exe.  Then run it.

The problem will likely not be immediately fixed.  We have found that you must then navigate to a Cimatron file from windows, right click over it, and choose to "open with" Cimatron.  That should finish the fix.