I have a couple of master pages that I have downloaded into the _catalogs/masterpage/ folder, but when I try to copy any .master file using Windows Expolrer, I get the following error message: "Could not find this item. This is no longer located in..."
I can open and edit them in SharePoint Designer, but having to open each one .master file and copy pasting to my backup folder is going to take a while, because I have a few master pages.