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The environment variables used by some shell links for the Live-environment,
are passed as data by CMake on the MKSHELLLINK build tool command-line.
When building on Windows, they are transmitted to the tool via CMD.EXE,
and we have somehow to force CMD.EXE to keep these variables unexpanded.
Depending on the precise context where these variables are being used,
either use an "escaped" format with `^%`, as in: `^%SystemRoot^%` ,
or, surround the variable name with `^` instead: `%^SystemRoot^%` .
This second form appears to work when the variable is specified within
a quoted sub-string given to the CMD.EXE command-line.
Addendum to commit a46e1e96ec.