I'm pretty sure that he meant:
"That may not be supported by all Operating Systems".
Meaning that there are some Operating Systems that won't support sizes that large (60GB) for a single file.
you are correct, this is what i meant by that statement.
However, on second thoughts, I realize that only filesystems such as FAT16 and FAT32 will not be able to handle that file size. (FAT16 cannot even have a partition larger than 2GB) Generally, even someone still running Windows XP (definitely not recommended) can be expected to have it installed on a NTFS drive.