Welcome to WebmasterWorld Guest from 18.104.22.168
Forum Moderators: bakedjake
Maybe you have seen in emails that some non-ascii characters are displayed as =XX, for example =0A for ascii 10, newline.
If for some reason the file has be subjected to some similar kind of binary to clear text encoding, that would explain the increase in size, including the order of magnitude of the increase.
Just a guess, though.