My guess is click farms with some unknown custom made os that skew that data?
That also might be a source of Linux users hence the relatively high market share of the OS?
Not to mention that India still has a lot of call centers (some for scams) that may use Linux because it’s free (compared to a windows license)
People suggested formatting to exFAT which is valid, but first you could just try either compressing the file (tar czvf file tarball.tgz for instance). FAT32 cannot handle files larger than 4GB, and compression might just make your file small enough.
As a workaround you could also split it in half and stich it back on the target machine