If I had recognized the encoding as Base-64, I would have investigated it as such. As it stands, I had no idea what the encoding was (I thought it was some UTF-specific shenanigans). merlyn had mentioned on #perl that any MIME reader should be able to grok it, but I have no experience with the MIME::* modules. It wasn't until I looked at MIME::Parser that I followed the trail that led me to my goal.
Jeff japhy Pinyan,
P.L., P.M., P.O.D, X.S.:
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Comment on Re^4: Decoding UTF-8 charset in an .EML file (RTFBP)
I didn't recognize the encoding as base-64. I actually looked at the encoding and spent a few seconds thinking about it. At that point I noticed that it used letters of both case and digits and so I tried to think of encodings that used such. base-64 and uuencode both do that and a quick test showed that base64 worked.
I didn't let some initial guess ("UTF-specific shenanigans") prevent me from trying to solve the problem. (: Just FYI.