You could have downloaded Mpl 1.1 from our software library for free. This program is an intellectual property of JM Software. The program's installer is commonly called Mercurio.exe or mpl.exe etc. The most popular versions among the program users are 1.1 and 1.0. The program lies within Multimedia Tools, more precisely Editors & Converters.
From the developer:
MPL is a tool to make changes to MIDI files in batch and to process (send and receive) MIDI messages in real time. You can use it to automate your MIDI file editing work. Or build your own real time MIDI tools, like sequencers or arpeggiators.
You can load and process up to 20 MIDI files at the same time. Open multiple input and output ports. Synchronise with other sequencers.
You may want to check out more software, such as My Piky Load, JSignPdf or MSL 2012 Patch, which might be related to Mpl.