only if you promote it as such, however, i'm surprised no one (especially around here) has shifted the responsibilty over to Microsoft yet -- i.e. actually write a file sharing application that uses (or at least proxies in some way) the native functions of windoze:

- require all files that are to be shared, in an actual shared folder

- use Indexing Services locally to crawl the content, this would not only allow proper indexing of any text based(doc, pdf, whatever) content, but plugins could easily be written for other formats i.e. mp3 tags, etc

i would think the trick to this type of app would be to be able to make the local indexes published out to the 'net somehow - if i were a coder i might have better insight into this - but the jist of it is that file sharing has been around since networking began, it was kind of the whole point.. make it "illegal" to use what's already built into the operating system and you'll have to force the evil empires to defend them in court..