With 'Match whole string only' ticked it found nothing.
With it unticked it found these:

HKEY_CURRENT_USER\Software\Microsoft\Virtual PC\VPCVApps\Windows XP Mode\8eaecac8.Windows.XP.Mode - AppPath - file:%7BBA126AD7-2166-11D1-B1D0-00805FC1270E%7D
HKEY_USERS\S-1-5-21-1575597446-1753356474-449700370-1000\Software\Microsoft\Virtual PC\VPCVApps\Windows XP Mode\8eaecac8.Windows.XP.Mode - AppPath - file:%7BBA126AD7-2166-11D1-B1D0-00805FC1270E%7D

Thanks for that.

If I do decide to get a copy I need the paper version, the cheapest I have seen so far is around £24 on Amazon but I never looked any further.
I came across the other book you mention as well but my first impression was that it is too technical for me.
There were a few other's that I saw but they were more restricted in terms of content, i.e. batch files only.

Your opinion of it matches several other comments I read about it and make it worth looking into.

I noticed when I was sorting out the start menu/programs after I installed 7 that I had a number of PowerShell shortcuts but as far as I got was moving them.  :D
And I know when I have been looking for ways to do various things in the past I have come across VBScripts but I have no idea about either.

I've not used them for a long time but I might see if the local library service can turn up a copy for me to look at before I decide to buy one.
They have obtained a lot of books for me in the past including technical books although they tend to be harder to find and often come from college libraries.