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.
A: 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.

Please capitalize where necessary: discharge stack extension (250, 500 mm)
A: Discharge stack extension (250, 500 mm)

Please capitalize where necessary: † aus file analysis tool utilizes third-party software components.
A: † AUS File Analysis Tool utilizes third-party software components.

Please capitalize where necessary: kalender for december 2053
A:
Kalender for December 2053