OpenForAppend on Mac

Hey everyone, I was working with some functions to manipulate script files and had them working perfectly till I tried them on the Mac. After some debugging, I found out that openForAppend apparently does not work for the Mac platform. Testing shows that it returns "false" when you use it as a bool(on Mac). I'm just curious if anyone else has run into this issue and solved it yet, or could solve it. Any input would be greatly appreciated.


TIA