if your pc opens the dec file, but it's the wrong application, you'll need to change your windows registry file association settings. in other words, windows is associating dec file extensions with the wrong software program.
Can you repeat this sentence, but capitalize it correctly?
If your PC opens the DEC file, but it's the wrong application, you'll need to change your Windows registry file association settings. In other words, Windows is associating DEC file extensions with the wrong software program.