Just copy/paste the .dat file into the shared folder of your other p2p program and rename it "radio mystery.mp3" or whatever the exact filename is ...and begin resuming.
You have to be fairly certain that the other person's file
is indeed the exact same file, and renamed to exactly what they named it
(copy/paste the filename of course).
Stoepsel mentioned excess data inside the file so I'm not entirely certain of this, but I do know that you can rename the .dat file to .mp3 and it pretty much plays like an unfinished mp3 that I "presume" you could "resume".
Of course there's several ways of finding the right user, file, and server and begin resuming after renaming it. I've used Napigator & an old version of Napster, or an old version of
NFS ...one of SuxXx's tool's ...to find the file on one of the many servers in the first place, and joined two mp3's that had nothing whatsoever to do with each other just for the hell of it. Naturally, it's good for resuming what you
know is the same file. I've used the same method to resume what I figured was probably the same file because of the bitrate and size, but they were just named differently. One must be careful of this because that's how you get the "glitches" in the middle of the song at the resume point if they were not
really the same file. In fact, you can get quite a
"shriek" in the middle that way.
NFS is good (especially for the rare & obscure) and I still use it ...but usually as a last resort ...because it's not good to not share ...that hurts the entire p2p community. If everybody did that, there'd be nothing on there.