Prabably yes, except if you do direct hardware access or things like that. If it's just the standard WinAPI and ANSI C/C++ stuff, you can go ahead like it's the same thing. However, testing is never a bad idea :) Claudio -----Oorspronkelijk bericht----- Van: John Waters I wrote a C program and compiled as win32 application, it worked fine on win98. I tried it on NT 4, it worked too. Will it be able to work on Win2000 and XP as well? Sorry, I'm still using Win98 and NT 4, thus have no way to test my program on Win2000 and XP. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics