Oh yeah, I should also probably provide the debug information here...

Seems to be a problem specific to Windows 10, and setting OpenMPT to run in Windows 8 compatibility mode prevents it from crashing. Interestingly the plugin doesn't crash in VSTHost or MadTracker, most likely because those two do not declare to be compatible with Windows 10. I am tempted to say this plugin is simply not compatible with Windows 10.

Just confirmed: If I manually update MadTracker's manifest to declare Windows 10 compatibility, the plugin also stops working in MadTracker.
So this is a plugin issue, and you will have to ask the plugin author to fix it instead. Given that the plugin was last updated in 2008, I wouldn't get my hopes too high, though.
You can work around the issue by running OpenMPT in Windows 8 compatibility mode but I really would not recommend doing that, since it might have implications for other plugins and OpenMPT itself as well.

Another possible workaround which should not impact other plugins would be to force the plugin to run in OpenMPT's plugin bridge and then only set the compatibility settings for PluginBridge32.exe to Windows 8.
The better workaround is still to find an up-to-date and maintained plugin, though.