Yes. A text file is a text file, at least in windows.
Unless vista uses a non-DOS text format, or Unicode, it should work.
BTW, did those accounts were complete? I mean, with signature and all.
Using only the account name and not the signature will cause freelancer to create a new account. That's why I made the Signature mandatory for this version.
(If you find any mistake in my English, please let me know via a PM)
(Really, I speak terrible English, so please, tell me if I make mistakes. I'd like to improve it a bit )