i should prob have mentioned, if you do want to move the file to the external, you can just re-format it from fat32 into NTFS,
ofc you should backup any data on the drive/move the files, first if you want to keep the data
or optionally you can convert it, tho that takes a good deal longer time, especially if its a large drive with lots of data
use and run command prompt as administrator and type:
convert *drive letter*: /FS:NTFS
you insert your external drives drive letter where it says *drive letter* of if your external drive is marked E it says:
convert E: /FS:NTFS