Ubuntu :: Start A Program After Found All Drives?

It's a long story, but on my tri-boot (Ubuntu 8.04, Win 7, Win XP), both Win 7 and Win XP need to know that Linux has previously run. I've therefore written a little program in REALbasic that automatically creates a text file named linuxran.txt and puts it into the root folder of the partition where Windows XP is installed. Under Ubuntu, this location is known as "/media/Win XP". It's an 80 gig partition of a 1 TB drive, the same disk that Win 7 is installed on. In my partition app under Win 7, I labeled the partition "Win XP."

The good news: When Ubuntu is completely up and running, the program runs fine. It checks if the file already exists, and if it does not, it creates it. So in Ubuntu, under System ==> Preferences ==> Sessions ==> Startup Programs, I put my little program, figuring it would run just fine. The bad news: Unfortunately, it didn't. It's trying to start before Ubuntu has mounted the "/media/Win XP" drive/partition.

Possible solutions: 1. If I could somehow set my program to run after I know the other drive has loaded, I would be all right. I know the prog is fine once the drive is loaded, because it does what it's supposed to when I run it. Is there some way to put my app in the startup process after Ubuntu has mounted all the drives? 2. Put some code in my app to make Ubuntu mount that drive before the rest of the prog runs. Not sure if this one is practical. 3. Set the program to run, not when Ubuntu first starts up, but rather, right before it shuts down.

I like option #3 the best because it would require no re-coding. Ubuntu would have had plenty of time to mount all the drives. Is there some way to tell Ubuntu, "whenever you're told to shut down, always run this little program first?"