Because this file name is highly specific and likely refers to a particular download, I need a little more context to give you the right guide. Could you clarify which of these you are looking for?
Information on what this specific file package actually contains (e.g., software, a game update, or a specific dataset). sc23785-MSMMMM23.part11.rar
A guide on what to do if this specific "part11" is missing, corrupted, or showing a "checksum error." Because this file name is highly specific and
Are you having trouble the file, or are you trying to find out what it is ? a game update