How is that relevant to the OP?

Because, by default, every windows perl build is configured with large file support. To build without it require manual intervention, and there is no good reason for doing so. And the vast majority of Perl installations on Windows are AS binary distributions that all come with large file support.

So, whilst it isn't impossible for the OP to be using a perl build that has been deliberately crippled, the likelyhood is small.

This:

I think the OP's basically stuffed unless he can get another program to chop the file into smaller pieces,

Is FUD because:

• because it demonstrates a complete lack of understanding of Perl on Windows.
• it assumes just about the most unlikely reason for the problem based upon no more information than the mere mention of "huge file".
• even if your assumption as to the cause of the problem turns out to be a lucky correct guess, you offer the very worst solution to that problem.