Quick'n'dirty... Load developer, zmodem all fids.
Dirty, yes. Quick? No. That method uses the serial port only, so it's far from quick.
To answer the question more directly:
Since you have a Mark1, EmpegTaxi is your only option at the moment since it uses USB. Other options (displayserver, etc.) use ethernet, which your Mk1 doesn't have.
The problem is that EmpegTaxi only lets you manually grab one song at a time, and you have to know their titles. Depending on the number of songs, this could be a hassle.
In theory, someone could use the Emptool sources to build a windows-based multi-file backup utility that uses USB, but I haven't seen it yet.
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Tony Fabris