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MLF File - What is an .mlf file and how do I open it?
Learn about .MLF files and view a list of programs that open them.
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What is an MLF file? An MLF file is a layout file used by MIRP (MIDI Input to Roblox Piano), an application designed to map MIDI keyboard input to keystrokes for playing Roblox Virtual Piano. It contains a custom mapping in which each MIDI note corresponds to a specific key on a standard keyboard. Mappings stored in MLF files allow users to play a MIDI keyboard and have the mapped notes produce input on their computer keyboard.
More Information The software's helper tool, MIRP Layout Designer, creates and edits MLF files. Users saved layouts in the MLF format via this tool and then import them into the MIRP app for use. While the tool provides a visual interface for assigning keys (clicking on a note and pressing the desired key), the resulting file stores information in a plain text format that a user can manually edit if needed.
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| Developer | GreatCorn |
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What is an MLF file?
An MLF file is a layout file used by MIRP (MIDI Input to Roblox Piano), an application designed to map MIDI keyboard input to keystrokes for playing Roblox Virtual Piano. It contains a custom mapping in which each MIDI note corresponds to a specific key on a standard keyboard. Mappings stored in MLF files allow users to play a MIDI keyboard and have the mapped notes produce input on their computer keyboard.
More Information
The software's helper tool, MIRP Layout Designer, creates and edits MLF files. Users saved layouts in the MLF format via this tool and then import them into the MIRP app for use. While the tool provides a visual interface for assigning keys (clicking on a note and pressing the desired key), the resulting file stores information in a plain text format that a user can manually edit if needed.
How to open an MLF file
You can open MLF files with GreatCorn MIRP. To open an MLF file with MIRP, select File → Open . Since MLF files store plain text, you can also open them with a basic text editor, such as Microsoft Notepad or Apple TextEdit .
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Programs that open MLF files
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Category: Settings Files
Updated: October 27, 2025