[wix-users] MSBuild targeting an .xproj

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Hi,

I was trying to set up an installer to install an Asp.net 5 Project that
has a file extension of .xproj instead of .xsproj. I get the error below
whenever I try to create the installer.

  C:\...\Myproject.xproj : error MSB4057: The target "_CopyWebApplication"
does not exist in the project.

There doesn't seem to be much information about solving this issue online,
or at the very least none that I understand,
Is there some kind of solution that I'm missing or does WiX currently not
support .xproj extensions?