Fail Packing files.

I've been using WinSCP for a while now and its pretty neat but now i encountered some problems. When i pack my files from WinSCP and when its done i drag it to my desktop. when i click on it it shows me this error "! C:\Users\HP\Desktop\comeon.tgz: Unexpected end of archive
". its really irritating me and delaying me for the stuff i have to do. Is it something related with WinSCP or my files? Can i just transfer files from a session to another without having to do all this?

Please help me.

So is the file really corrupted after the transfer? Have you checked? Does it have the same size as on the remote side (I suppose that you pack it on the remote side, right?)