Read File at > 2GB Problem

[Dave]

Hi,

I have a File that is greater than 2GB in size. I am using:

read from file theFile at myFilePosition for myCount
put it into myFileData

It all works fine until myFilePosition is greater than 2GB. Is there  
a limit on the file position inside a file?

I Calculate the value for myFilePosition based on number of factors.

Thanks a lot
All the Best
Dave