Roger,
I was going to ask if you have a saved backup, and then help you find where Qimage keeps the saved printer setups, but I think you would have it by now.
The best way to save the printer setups is to set up the printer with all the settings; Driver settings being the most important. That includes, paper type, Size, Quality, (if you use printer profiles) includes No Color Adjustment setting, page size, and anything else related to printing setups that you like.
Then click File, Save, clcik the "P" button, name the setup, (ex. Epson1800_Luster_8x10), and SAVE.
If you right click the "P" button, you can make that the default button which will be highlighted whenever you open SAVE or RECALL.

Of course you have to do it again for a different paper, or size or printer..... being careful that you recheck the driver each time before the SAVE that it still holds the settings you want.
Some drivers revert to "plain jane" settings whenever you change paper size or type.

I hope that's what you wanted.

Fred

Roger,
That command line "looks" good, but obviously, some syntax is incorrect.
Maybe, Mike will read this later or tomorrow, (It's Sunday) and be able to set it for you.
I read Desktop/command line, but didn't think you meant that.

Mike should be able to help!

Fred
PS. I recall that the last bunch of Qimage updates moved files to different locations as part of a setting that matched the Vista and Windows 7 environment.
I don't know if you got a syntax error, or cannot find the file, error.
If it was the latter, you might want to look for the location of the SAVE folder and the PRT files.