Problems with quoted-printable attachment

I have a MIME email I've received generated by Microsoft Windows Mail
6.0.6001.18000.

In it are two PDF documents encoded using quoted-printable.

No matter what I do, or what method I try, I can't seem to decode the darned
attachments properly! Yet Outlook has no issues decoding. I've tried quopri,
email, even wrote my own decoder to see what I could figure out. All of them
generate a file exactly 150 bytes shorter than the version Outlook
generated.

Even looking at the two files side-by-side (using Crimson Editor, probably
not ideal for binary files) I can't see any differences.

Any thoughts folks?

Aaron