Windows cannot open OB$ files?

If Windows is unable to open file extension .OB$ you may have registry related errors or may not have the appropriate program installed. We strongly recommend that you run a free registry scan.

Appropriate program:
 
OB$ is a file extension associated with Compressed OBJ . Incorrect associations are the cause of many file extension errors. Scan your system to prevent, identify and repair OB$ file extension association errors.