check the submitted csv file

"Unknown file format" errors are frustrating! Sharing the file extension would help others suggest compatible software. Granny always said, "Details, dear, details!" Have you tried online format converters? Also, check if the file is corrupted. Sometimes renaming it with the correct extension (if known) can work. Good luck!

This could be a challenge, but perhaps it's a puzzle for us to solve, much like a tricky Pips game. When encountering an "unknown file format," consider if it's a corrupted download or an unusual extension. Often, online converters or specific software can help identify and open such files. Think of it as decoding a new level in your favorite game.