mplayer.exe is the executable for the Windows Media Player, an application that allows you to open, play and manages multimedia files.
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Non-system processes like mplayer.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that over time your registry suffers fragmentation and accumulates invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues