Finding Bad Files That Upset ConfigMgr

I was assisting a customer with deploying Adobe CS3 via SCCM 2007 and was hitting a brick wall with the package deployment constantly failing on all machines with:

I spent ages checking for hidden files, checking the WebDAV configuration on the BITS enabled distribution points for any requestFiltering that may be causing the issue, deleting the package from all DPs, deleting the package from within SCCM, re-doing the sources,