Story11,

I do not think there is a code that will work on both. At least I never came across one.
You may need to Id (in some way) that when the user open the file to to see if it's a "Mac" or "PC".
A thought is to catch the "Error" msg when you open the file. You can then call the correct code. I've not done this. But it's worth a try.
Let me know what happens.