I use the default search within Windows. Tell Windows to index the folder where your UBB files are, and make sure to tell it to index PHP files. Once you do that, and the index is built, you'll be able to search for strings inside the files just fine.
I tried this already. In fact I set it to just index the ubb folder and ran re-index. PHP is in the list but I suspect it is not indexing the files with ###.inc.php Still no success most of the time.
