I really don't think that an OS upgrade will make it easier to manipulate the files on your phone.
Supposedly the newer OS will interact with the phone, whereas Samsung apparently never intended for the S3 and XP to get along. But I am open to any other suggestions you have!
Oh - the only files I'm concerned with "manipulating" would be photos, videos, Office files, PDFs, and such that I might generate on the phone or download to the phone from the internet, Dropbox, et .
Ed