[2.7] Is there a separate list for Windows users?

No. Although "MacroMind Director for the Macintosh" still appears in Direct-L mail headers, this is just a historical leftover. Direct-L participants are users of both platforms. The Windows version is not yet as established as on the Mac, but Windows-specific and cross-platform issues are increasingly to the fore. Whatever platform you're developing for, Direct-L is the place.