If
the extension is .zip try to unzip (use WinZip 7.0). If not possible
than rename to .mp3. All other extensions rename to .mp3. Download
resuming possible with Go!Zilla 3.5 downloadmanager.
Copy
link into Gozilla and let this downloadmanager do the job. If you
get an 403 error, then use right mousebutton on link and "save
target as".