Members of the public often arrive with files in formats not compatible with the library's computers. (wps files from Works, for instance).
Sometimes I can convert the files for users, but I try not to get involved.
I just discovered Zamzar, which converts all kinds of files to other formats, documents, images, music, etc.
So long as the user has an email address to receive the converted file, it works well.
And you can't argue with FREE.