Without more context on what "MDPS" refers to (e.g., a specific game mod, part of a software suite, or a document), I cannot provide a specific report on that file's contents.
If you can provide more context on what stands for (e.g., a specific game or software) and where you saw this, I can help you find a safe and legitimate source.
Hidden executable files designed to damage your system.
If this is related to a specific game, mod, or software, (e.g., Steam Workshop, Nexus Mods, official developer websites).
Based on a search of the provided phrase, there is no specific, safe, or official report regarding a file named "MDPS part3 rar".