I’m unable to write a long article about the specific file MUDR-255-u.part11.rar .
To access the contents of this file, you cannot simply open it on its own. You must have all related parts
Don't rename the files! The extraction software relies on the exact sequence MUDR-255-u.part11.rar to know where it fits in the puzzle. The Mystery of MUDR-255
If your connection drops, you only lose a small segment rather than the whole 50GB file.