Windows cannot open O1 files?
If Windows is unable to open file extension .O1 you may have registry related errors or may not have the appropriate program installed. We strongly recommend that you run a free registry scan.
O1 is a file extension associated with Free Pascal Object files for GO321v1 Platform . Incorrect associations are the cause of many file extension errors. Scan your system to prevent, identify and repair O1 file extension association errors.