I'd be very happy to work out a script that could test a record to see if the file name is contained in a list of words (file name list) and then write some marker to the metadata for later extraction using the usual xMedia functions like 'find'
Yes, that would be relatively simple:
Use the Scripting.FileSystemObject to open the text file containing list of image files, and use those names a keys in a Scripting.Dictionary object.
Then, iterate over the files in the catalog, and test the name to see if it's present in the dictionary. If so, you could either select it, or apply a label to it, or rate it, etc.
If you want, you can send me the file list (in whatever form it is), and I can probably whip up a script quickly. If it's general enough, I can incorporate the script into my Expression Media scripts package (available from my website). Otherwise, you could study my scripts for ideas.
-Matt
http://home.earthlink.net/~matthewjheaney/damtools/index.html