Uploading .ISO files

[eluser]vonshavingcream[/eluser]
I have done the following in testing and trying to correct this issue.

1. I am able to upload 4GB .zip files with no problem.
2. change extension from .iso to .zip - Fails with error.
3. compress .iso to .zip - Successful Upload.
4. change extension of .zip file to .iso - Fails with error.
5. uploaded 400k .zip file - Success .. rename 400k zip file to .iso .. Fails with error.

Most of the files I am testing with are between 1 and 4 GB. Our server is set to handle up to 6GB which it does correctly. I tried the smaller file at your suggestion with the same results.