Problem with multiple configurations in Visual Studio

[tim-wilkins]

I've updated some projects from Wix 3 to Wix 4 and now the configuration manager in Visual Studio offers configurations "Release" and "Debug", even though the actual configurations are "Release" and "Release Virtual" (to make use of alternative configurations on other projects). Obviously I can duplicate projects but this isn't ideal. I tried manually editing the solution (sln) file and then it failed to build and didn't show a configuration.