calling com port under win7 with old 261 built app

[Jeff Reynolds]

Hi,

i have an old app made from rev 2.6.1 that calls the serial port. been  
running for years under xp, but the client just tried it on a new win7  
box and it doesnt look like anything is making it out the serial port  
on the new machine. he confirmed the device driver shows the single  
com port on the machine is set up as com1 and he has changed the pref  
on my app to com 1 (i had that built in there). does win 7 do  
something different that an older rev would not do to call the serial  
port? do i need to rebuild the app in a later version of rev to create  
a win7 app that will call the com port on win7?

thanks

jeff