$ WINEPREFIX=$HOME/.foobar2000 wine "/path/to/foobar2000_v1.6.4.exe"I verified myself it works.
$ WINEPREFIX=$HOME/.foobar2000 wine "$HOME/.foobar2000/drive_c/Program Files (x86)/foobar2000/foobar2000.exe"
As for your custom foobar config, one of the 3rd party components might require vcrun2015 so you can try to (re)install it with winetricks.
wine: Call from 7B0100F6 to unimplemented function api-ms-win-core-winrt-error-l1-1-0.dll.RoOriginateError, abortingThat's the reason anyway your foobar is crashing on launch. I don't know what changed with wine 6.6 to cause it, try asking on winehq forums.