You can manually enable Visual Studio 2017 compatibility with WiX 3.10 or earlier:
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Close all instances of Visual Studio.
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Copy
C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\Extensions\Microsoft\WiXto
C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\Common7\IDE\Extensions\Microsoft\WiX(In the destination path, replace “Enterprise” with “Professional” or “Community” depending on your edition.)

You may need to provide Administrator permission:

The result will look like this:

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Copy
C:\Program Files (x86)\MSBuild\Microsoft\WiXtoC:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\Microsoft\WiX -
Then execute the following command as Administrator:
“C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\Common7\IDE\devenv” /setup
(Again, replace “Enterprise” with “Professional” or “Community” depending on your edition.)

When you open Visual Studio 2017, WiX 3.10 and earlier projects will be compatible.
