Problem with IIS WebDAV LOCK implementation

\Hi,

There is some problem with LOCK method. Can anybody help me? I'm
working with Adobe Framemaker (last stable version). I'm trying to
work directly with Sharepoint directory by WebDAV protocol. But then
Framemakers locks some document it sends:

LOCK /path/document HTTP/1.1
....
COMPANY\username (MountID:c5177e34-
c5d8-11dc-95d1-cc305a4e51d1)
....

As a result IIS sends for this document (for PROPFIND request):


COMPANY\username

The problem is that IIS (or Sharepoint) loses part of request
(MountID ....) and saves only COMPANY\username. Framemaker uses
MountID to determine user access rights etc.

Also I tested FrameMaker with Apache WebDAV. Apache sends 'owner'
correctly (with MountID).

Is it possible to turn on IIS to work correctly with 'owner' element
in WebDAV?

Thanks