Having problems here. Dragging and dropping the .exe file doesn't seem to be doing anything in the setup window. The "search" tab won't find the program (most of the listed entries are in symbol font and all the help documents appear to be in Japanese). The "patch" button also remain grayed out.

Hmm... not sure what would prevent the drag and drop function from working. Maybe it's a Windows 8+ thing. ¯\_(ツ)_/¯

Machines can be added to the list of games in _inmm dll setup by editing the config file:

1. Navigate to the _inmm install folder (e.g. C:\_inmm\).
2. Open _inmmcnf.ini with Notepad / your preferred text editor.
3. Copy the below text and paste it at the end of the file.

[Machines]
Group=Acclaim
RegKey=HKEY_LOCAL_MACHINE\Software\Microsoft\Directplay\Applications\Machines
Value=CurrentDirectory
File=Machines.exe

4. Save _inmmcnf.ini and exit Notepad.
5. Run _inmmcnf.exe.
6. Machines should now appear under the "Acclaim" group in the Patch tab. It can also be found using the "Find" button (type "Machines" in the box). Assuming the registry entries are correct, selecting Machines in the list and clicking "Patch" should work...

My only worry now is playing on maps where the AI's algorithms are tied to processor speed... (Behind Enemy Lines lel)

https://drive.google.com/open?id=1Vslhbrn9-yFmbUfYJL-BYlgSy5LNh13Q

Just extract the files to the installation directory, it will add 4 dll files and a music folder. Default is 12.5% volume, you can overwrite the files in music folder with the ones with 25% volume folder. If you want to disable music completely, rename or remove the music folder, but leave the dll files which will block the CD music. The music folder has 3 extra tracks(just copies of menu music track), because otherwise it wouldn't play correctly, maybe because the dll files were originally configured for a different game, I don't know.

As for music not looping in the game, in my case it would loop, but not right away, it would take about a minute to start playing again.

6. Using Windows Explorer, navigate to your Machines install folder, then drag-and-drop Machines.exe onto the _inmm.dll setup window.

Having problems here. Dragging and dropping the .exe file doesn't seem to be doing anything in the setup window. The "search" tab won't find the program (most of the listed entries are in symbol font and all the help documents appear to be in Japanese). The "patch" button also remain grayed out.

With some effort, it's possible to work around the problem using an audio wrapper called _inmm.dll.

I haven't tested this very thoroughly yet - there may be better options, this is just what has worked for me so far (hopefully it will work on Windows 10):

Preparation

1. In your Machines install folder, create a new folder "Music".
2. Rip the music files from the CD into that folder, or download the Machines OST and extract it to that folder.
   (If you use the .flac soundtrack files, you may need to install the OpenCodecs pack from here (opencodecs_0.85.17777.exe) for playback to work correctly)
3. Make a backup of Machines.exe.

Install/config

1. Download _inmm238-installer.zip from here ("Download this file").
2. Extract it somewhere, then run _inmm238.exe to install the wrapper config / patcher program (to, for example C:\_inmm\).
3. Navigate to the install folder and run _inmmcnf.exe.
4. Edit the file types and players on the "Method" tab to match this image.
5. Click on the "Patch" tab.
6. Using Windows Explorer, navigate to your Machines install folder, then drag-and-drop Machines.exe onto the _inmm.dll setup window. ! This doesn't seem to work on Windows 10 - instead, try these instructions.
7. When prompted "Patch these files?", click OK.
8. Click on the "_inmm.ini" tab.
9. Using Windows Explorer, navigate to the Music folder in your Machines install folder, select all the music tracks, then drag-and-drop them onto the text box in the _inmm.dll setup window. ! This doesn't seem to work on Windows 10 - instead, click the "Add" button, navigate to the Music folder in your Machines install folder, select a track and click "Open" (if using .flac format, you may need to change the file filter from "Sound files" to "All files"). Repeat until all (10) tracks are added.
10. Click "Save" and save the _inmm.ini in the root of the Machines install folder.

Run Machines.
Tracks should now cycle correctly, and you can adjust music volume by using the Windows Volume Mixer to adjust the volume of _inmmserv separately from Machines. A bit awkward, but functional.
Unfortunately the in-game volume sliders remain broken.

Note: music may stutter when loading a level - may be affected by HDD read / access speed.