If that's the case, you might need to temporarily stop sharing the folder this file is in. Before you stop sharing, go to LW's menu-Tools-Options-Sharing menu & make a note of the folder(s) name, location & path. Now you can stop sharing; select the appropriate shared folder in your LW Lib window, Go to LW menu-File & select Stop Sharing Folder. Now you can delete the file. To resart sharing that folder again, go back to the LW menu-File & select Add file to Share, Or go back to LW menu-Tools-Options-Sharing & reset/reselect your shared folder(s) & start sharing again.