RAR files are often used to package game mods, software patches, or technical documentation for specific versions of a program (where "22240" might be a build or version number).
You will need an extraction tool like WinRAR , 7-Zip , or The Unarchiver to open the .rar archive. 22240.rar
It may be a compressed archive containing internal documentation or "guides" for a specific organization or project. RAR files are often used to package game