No, none of the Gnuttella clients allow internal file searching. Some include the folder name in the search, but other don't. I just had to rename my files, but I only about 2,000.

1. You could rename all of them.

2. Or you could share one file that indexes all of them. You must have a text file or a database file so that you can tell what they are all right? Well then share that file. Put a note at the top telling people that you are sharing all the files listed there just search for their MYS0000x name. Make sure that main file has a good name and then some key words at the end so it comes up on searches, for example: "300,000 text files on various subjects (MYS00000 ebooks SciFi Fantasy UFO Aliens Magic)." I would be sure to include "300,000, MYS00000, and ebooks" in the name. You could also try a couple of different names till you found one that people could find and download. But it should work fine that way and same you a lot of time renaming.

Hope this helps.