I just bought Virtual Pool Mobile, the version optimized for the X50v/X51v for my Dell Axim X51v. There's not enough room in my main memory so I tried to install the game to my SD Card, where there is plenty of room. The installer program on my PC ran, but when my PDA begins its part of the installation process, the message on my Axim immediately said Installation of Virtual Pool Mobile was Unsuccessful.
Luckily, after a few unsuccessful tries, I found that the .CAB file was on the SD Card on my PDA. I was able to run it from my PDA and it then allowed me to successfully install it. (The game runs very nicely, by the way.) :)
I figured I'd post this in case someone else has the same problem and might not have found the CAB file solution.