: Right-click the file and select Rename . Ensure the name ends exactly in .rar . If it ends in .rar.txt , delete the .txt part.
To help further, could you tell me or game you're trying to launch? Knowing the source of the download would also help me confirm if the file is safe to open. Haksiu Launcher.rar
: If the file still looks like text, right-click it, select "Open with..." , and choose your installed extraction tool (like 7-Zip or WinRAR). Safety Note : Right-click the file and select Rename