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in_msx.dll aka MSXplug is a MSX sound player plugin for Winamp 5. It supports the following sound formats.

EXT Description
.kss Sound data from varius systems
.mgs MGSDRV data
.bgm MuSICA or Kinrou5 data
.mbm MoonBlaster data
.opx OPLLDriver data
.mpk MPK data

Note: zip-compressed .kss files are not supported.

How to install

  1. Download from the release page.
  2. Extract zip file and copy both in_msx.dll and in_msx.ini to Winamp 5's plugin directory.
  3. Restart the Winamp.


If your Winamp is installed to a system folder like C:\Program Files\ on Windows 8 or later, settings modified from MSXplug's UI can not be persisted. To solve this problem, install Winamp to user's private folder instead of system folders. Or change security settings of in_msx.ini file:

  • open security page on in_msx.ini properties sheet, select Users and then give write permission.

User Interface

File Information Dialog

Right click on the playlist entry and select View file info... from the context menu.

Then, File Information dialog will appear.

from View menu, you can access channel mask, tone editor, lyrics and configuration dialog.

Channel Mask Dialog

All channels can be muted separately. Changes are immediately applied on playing music.

Configuration Dialog

You can also access this dialog by pressing F12 after in_msx plugin is activated - if no msx song is played, the plugin is still inactive thus F12 does no effect.

Bonus - Retro Filter

If you prefer a retro low-pass like MSX turbo-R or FMPAC, try R=3870, C=15 and turn RC filter check-box on.

How to build

Install cmake 3.4 or later, git for windows and Visual Studio 2015 or later.

Then, run the following commands from git-bash shell to generate in_msx.vcxproj.

$ git clone --recursive
$ cd in_msx
$ mkdir build
$ cd build
$ cmake -A Win32 ..
$ cmake --build . --config Release

You can also open in_msx.vcxproj with Visual Studio. To obtain in_msx.dll, just build in_msx project. If you have some error to find MSVC compiler, try CMake 3.6 or later.