[propbeanie]

An external hard or ssd drive, and it won't let you access the "Properties" screen? Are you certain you are selecting the SH4.exe file? If you do not have "Hide extensions for known file types" cleared in folder options, and do not see the "exe" or "ico" file name extensions, then be aware that the files are listed alphabetically, and that SH4.ico will list 'below' SH4.exe - be sure you are choosing the exe file, which will have a "Compatibility" tab on the "Properties" page.

Open your game's "root" folder, such a "E:\Ubisoft \Silent Hunter Wolves of the Pacific", or whatever you installed the game into. Find the first SH4 file, right-click it, and you should get a "context menu" that will have "Properties" at the bottom of the list. Left-click on that, and it will open the Properties to the "General" tab. On that tab, be sure and clear the "Read-only" tick box under "Attributes". Your LAA or 4Gig Patch will activate properly when that box is cleared. Next, click on the "Compatibility" tab of the Properties window. This is where you will have to experiment, but you can almost be certain that you will have to have "Override high DPI..." and probably "Disable fullscreen optimizations" ticked... "OK" your way out and test it. You might have to come back to that same page and try other settings.