Windows Mobile Standard

I write mortgages for a living and am converting back from Palm OS. I cannot get my pocket pc loan software to install on the Q. I know there is a difference between Pocket pc and Windows Smartphone software but where can I get a loan calculation software for the Q? Or is there some way to install what I already have? The error on the phone says the .cab file is not intended for this device... please help as I will need to retun this thing in a few days if there is no software..