I've never heard of that jpegPhoto attribute but if it exists you will not find it in AD Users & Computers - you could use ADSI Edit (built in with Server 2008, free download for Server 2003) to view all of the attributes of a user object.

EDIT: in fact a quick google of that attribute returns the following VB.NET tutorial on how to use it http://blogs.technet.com/btrst4/arch...30/222629.aspx