The client and server log files are named (server)log.txt.#.
Most operating systems/file browsers identify files by their "extension". The extension of log files should be .txt or .log so OSs report correct file types, and improve user experience when trying to upload log files to the support forum.
Change log.txt.# to log.#.txt
Effect: OS and forum software recognizes files as valid type
Side effects: alpha sort order is not affected