So, is your situation like this? You have a number of clients who need to be able to update files on your server which runs IIS? They will initiate the uploading process, and they need to be authenticated? (if so, how?)

A reasonably standard way of handling this sort of thing would be to have your IIS machine run a CGI program that accepts file uploads; LWP is powerful enough to handle form submissions, including file uploads. If you search this site on "file uploads" you'll get more info than you want right now on how to write the CGI program. As for the client software, (the one that would use LWP) there's a book by Clinton Wong on writing Web Clients in Perl (published by O'Reilly and Associates that you might check out (if follow the link, there may even be a sample chapter).

An alternate option is to handle the whole thing with FTP, with your IIS machine being the FTP server that accepts uploads; Net::FTP is the standard Perl way of writing an FTP client.

HTH!

Philosophy can be made out of anything. Or less -- Jerry A. Fodor