WaWaWang,
Maybe you are using the hacked version of PC Link 1.2 - the hacked version cuts long names to 8.3 format, so "alongnamelikethis.zip" will be tranferred as "alongn~1.zip" for instance.
Even though the hack is great I personally hate the "~1" thing so I rename my files.
I'll definetely look into the Magic File Renamer program.