i had the same problem with blackwell unbound, but it started working after i renamed the .exe to ac2game.dat. i can't do it with the other two, because they already have ac2game.dat in their directories, apart from the game executable.
This means one of the files is excessive. You need either EXE, or ac2game.dat. If the launcher expects exe, then delete ac2game.dat instead. Anyway, there's no sense in having both of them there.
This does not explain why engine cannot find the game file... unless their format is corrupted, or similar. Frankly, I have no idea right away.
BTW, which version of AGS Android port are you using (or which date of build)?
i'm guessing maybe they were compiled using an unsupported version of the AGS editor. so is there any workaround or any way to recompile them using a newer editor version?
These games are old, and there were not any other editor versions aside from official ones back then, so I doubt that is a reason.