Depending on what you are looking for, here is the most relevant information:
: A common framework used for modding FromSoftware games can sometimes be confused with Mass Effect naming. You can find documentation on using this tool at me3.help . MEO3.rar
: This is the primary fan-created toolset for modding the Mass Effect trilogy. For help using these archives, refer to the ME3Explorer Wiki . 2. MO3 Audio Files Depending on what you are looking for, here
Most often, ".rar" files with "ME3" or "MEO" in the name are archives for game modifications. MEO3.rar
: These files are typically played using XMPlay or the BASS audio library. 3. RAR File Handling
: Use software like WinRAR or 7-Zip to open the archive.