The retail version mine not work correctly with this fix as I only tested it with the Steam version.
However, if it's only running on one monitor then you need to change settings via the console or edit the .cfg files.
Check the detailed report for this game to see the settings you need to modify.
The important thing to check here is that when you run the game, without enabling the fix, alt-tab back to Widescreen Fixer and look at the main application.
It should show an address for both the base address and module address. It should also show the default aspect-ratio under X/Y. If any of these values say N/A, then it will not work.
As for the aspect-ratio saying 126/25 under configuration when you enable auto-detection, that's because it finds the greatest common divisor and uses that for calculating the aspect-ratio.
6048 / 1200 = 5.04
126 / 25 = 5.04
The greatest common divisor of 6048 and 1200 is 48.
Okay thanks for the info, edited the cfg file and used your fix and it's working now. Thanks.