As i said before, this whole idea is in the stage of ideas..
You can put up every file or ext. in this list, and maybe even people who you trust you can add to the whitelist, so their files are "safe" and you will receive it just as you do normal...
It doesn't really check the contents, you must use a virusscanner for that..
Maybe it can check known filenames & filesizes or contents of pif, bat, com etc...
Why is it so hard simply not accepting files you havnt asked for, from people you dont know, files you dont know what is, and getting an antivirus program.
I have decided that in my Plugin for Organizing Recieved files that there will be an option to auto delete specific extensions and organize on load. Also the entire plugin is being recoded at the moment so don't expect it any time soon.