The path posted is incorrect, it should be:
"C:\Matrix Games\War in the Pacific Admiral's Edition\Beta2\War in the Pacific Admiral Edition.exe" -SingleCpuStart -cpu2 -fd -pxf1920 -pyf1080 -deepColor -dd_sw -altFont -skipVideo -archive
Although you may have it correct in the desktop shortcut and perhaps something got garbled when copying it to your post. Even if the punctuation is correct in the actual shortcut, it's still missing a critical piece - the "Beta2" subdirectory where the beta resides (i.e. version .26b). That said, even a path to the WitP:AE main directory should still work... it will just run the official release instead of the beta; the beta and official releases coexist rather than the beta replacing the official release.
Note I added the -fd, -dd_sw, and the -deepColor switches. You can change -fd (Fullscreen, daily autosave) to something else if you prefer, and -deepColor can be deleted if you prefer to exclude it. You probably want to keep the dd_sw, as it's the swtich that typically resolves interface lag (except in some cases on Windows 10 versions 1709+).
However, this is a happy coincidence. You get to be my guinea pig! I've been working in my spare time to produce a 1st release of my WitP:AE configuration app, SeaBee. I've created two game shortcuts using SeaBee for you to try, and have attached them as a .zip file. One shortcut is to run the beta, and the other is to run the official WitP:AE.
Double check that I got the file path correct... I had to do some minor guesswork, but I'm fairly confident I got it or am close. In any case, the shortcuts provided should be a solid template that you can perhaps make the final tweaks to make them perfect.
< Message edited by Korvar -- 3/4/2018 3:04:51 AM >