COMDLG32. OCX is a Windows file, which, if it's missing, may affect the availability of some applications. To avoid this issue, I suggest you go to the Google website and download COMDLG32. OCX. After the download is complete, move this file to Windows\System32 folder. Go to Start > Run > and write there regsvr32 Systemroot\System32\comdlg32.ocx and press Enter. After that a message must appear: DllRegisterServer in C:\WINDOWS\System32\comdlg32.ocx succeeded.