<p>My company has login integration with GroupWise, and Exchange 5.5/2000+.  The Exchange 5.5/GroupWise logic is done using wldap32.dll (win32), and so the login code is in a managed c++ class.  When the configuration tool (or the backend service) tries to load the dll built off this managed c++ project on my XP development box, it works fine.  On QA/Customer Windows 2003 boxes, a FileLoadException is thrown.</p>

<p>First off, this used to work fine.  Secondly, I've validated the same working code on my box fails on the qa box.  </p>

<p>How can I track down the cause of this exception?</p>

Not to answer my own question, but support just updated the bug with the text following this paragraph.  I'm still interested in thoughts on tracking down situations like this.
Resolved by downloading and installing the Visual C++ 2008 Redistributable
Package for Windows on the IMS:
http://www.microsoft.com/downloads/details.aspx?FamilyID=a5c84275-3b97-4ab7-a40d-3802b2af5fc2&DisplayLang=en