The File Extensions Database


.G18 File Extension

  • Category: Audio and sound Files

What is an .G18 file?

.G18 is Recomposer MIDI Sequencer music file

The g18 file extension is sort of MIDI sequence format file. This format is produced from some sequencers released from Come-On Music's products, Recomposer series ( These are only famous in Japan). Since these format is very popular in Japan, many MIDI sequence data based on these format instead of Standard MIDI file (SMF) are existing. There are even some free software sequencers those are capable handle these format.


How to open:

This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.

How to convert:

As far as we know, this .g18 file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

How to solve problems with G18 files

  • Associate the G18 file extension with the correct application. On :
    Windows: Right click on any G18 file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.G18 files". Mac: Right click (or Ctrl-click) the G18 file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .G18 is Recomposer MIDI Sequencer music file. Because only the current version supports the latest G18 file format. Search, therefore, e.g. on the manufacturer website after an available .G18 is Recomposer MIDI Sequencer music file update.
  • To make sure that your G18 file is not corrupted or virus-infected, get the file again and scan it with antivirus software.