Here you can configure what program should be used as viewer for your PDF/JPG/PNG/Text files instead of the windows default. This can be used if PDFCreator is not able to read the correct viewer from the Windows settings.
After activating a custom viewer for one of the output formats, you have to select a program that should be opened for files of the respective format. The parameters are optional and can be used if your program needs special arguments to open files.
Note
We call the program in form of “{executable path} {additional parameters} {file path}”
The changes will have an effect if you select to view your output after conversion, in the quick action window after an interactive conversion or when opening the output from the job history.