How to read ADP custom properties
Fortunately Google Groups knows everything! I found a following tread, discussing this issue. Sylvain Lafontaine (MVP) points to article Tales from the Script, which brings some light on this problem. Furthermore – there is an article in MS KB “Dsofile.dll lets you edit Office document properties without Office in Visual Basic .NET 2003 and in Visual Basic .NET 2002”, which shows samples using Dsofile.dll.
Currently I am improving our VersionCheck, so it can also work with ADP files, and let you know on results.