I think this is somebody on the M5 forum.
It appears to be a pdf of a genuine bmw service manual.
this is the M5 forum post:

http://www.m5board.com/vbulletin/showthread.php?t=84789

site hosting the file:
http://formulaconsulting.net/~m5board/e34%20bmw%20service%20repair%20guide%20v1.0.pdf

You can check the M5 forum post above to get the mirror sites for this if the above link doesn't work.

Though I question the legality of this, this is awesome! :thumbup:

...was just a matter of time....

OMG Thank you soooooo much I've been looking all around for that thing.
Awsome !!!