https://bugs.winehq.org/show_bug.cgi?id=47858
--- Comment #6 from Rafał Mużyło galtgendo@o2.pl --- ...well, this bug is kinda concluded, yet not.
wine now has builtin xactengine2, but the problem now is FAudio.
As per src/FACT_internal.c (FACT_INTERNAL_SupportedContent), FAudio doesn't support pre-3.0 content.
For Supreme Commander case, this means it's not supported. It's also nothing that could be fixed in wine, short of finding a different library for it.