Urgent problem!

Ladies & Gentlemen:
I have a big win32 application project with several hundred files of *.c and *.h.All these source codes are composed of standard c and some windows API. And now ,I want to port them to Palm.
I use Code Warrior for palm os as development environment. I wonder what should I do,if I want to compile correctly at first.
Some concrete problems are as follows.
1. How to replace the windows type which are different from palm?
2. How to solve the including head files problem?

Thanks!

Going from Windows to Windows CE would be a lot easier than going from Windows to PalmOS.

The GUI routines are very different. You will probably need to rewrite the ones using the Windows API. Most Windows screens are quite big (640x480 - 1280x1024) compared to the Palms (160x160) so you will probably need to redesign all the screens too.