Please capitalize where necessary: if your pc opens the xc2 file, but it's the wrong application, you'll need to change your windows registry file association settings. in other words, windows is associating xc2 file extensions with the wrong software program.
If your PC opens the XC2 file, but it's the wrong application, you'll need to change your Windows registry file association settings. In other words, Windows is associating XC2 file extensions with the wrong software program.