I was unable to find a specific file named sc23780-TF2.part05.rar in any standard public archives or game mod repositories. This naming convention typically refers to a , where a large file has been divided into multiple parts for easier downloading or storage.
: Bundles of community-created cosmetics or weapons. sc23780-TF2.part05.rar
If you can provide the or website where you saw this filename, I can help you track down the missing parts. I was unable to find a specific file named sc23780-TF2