Quote - - open that file, and parse for the word "runtime" in it (make a loop with "cat $1 | grep "{Rr}untime" " in it, and yes I know the brackets are wrong) , packing each result into an array.

Hmm .... nice plan ... I did the same with some VB-code and a Access-Database ...

But ... huh ... people, especially free content providers, but not only these, are mostly genius in finding all possiblities to have false or "not so" correct references. EF/SM theirself did a absolute lousy archetype while pushing real CR2 stuff as PP2 in the props folder or mixing obj files into the library paths instead the geometries folders making rearranging stuff a worse play.

In the end I found it was more work to get things straight this way and decided not to invent the wheel again.
So after long search I opted for D3D's program's for correcting all that issues in the runtimes. You will find them here in marketplace. A bigger one for all purpose but intended for people knowing the backgrounds and a smaller one for "push button users".
These program are not only correcting all problems in library files but can also rearrange/create new runtimes with moving or copying content to new places.
So I think this is best program for runtime maintainance and such also with look to the cost-benefit relation.

For using the content I normally took the poser internal pallet but may be I have to go to P3DO or D3D's new XL cause the new flex library is to tiny with the icons. And I'm not amused for several reasons to have flash working and eating ressources in the background ... the old windows desaster, wasting ressources with no need and using network stuff internal on pc for better fulnerability also without no real need.
But for a final decision on this I wait for the SR1 until jumping on P8.
This is not new I did so since P5 and found it a good solution. As software developer I'm in no need to develop green bananas I've bought for fun until they are a bit yellow. I have enough own green bananas around ... :-))

For the searching of stuff you should look also to D3D's website. He has build a small utility (only windows, but freeware) for searching files and/or folders in given paths. Also maintaining search words in the files. It's in the manner of the original windows searcher but lot's better and quicker and much more handsome.
As far as I have read until now the new poser search function will only rely on file and/or folder names. So this utility will be needed further on for a good search job with the ability to have also a look into the files.
This will also work for Zip-files but cause not unpacking it's limited to search patterns that could be found in binaries. But most pathwork in zip's can be found this way.