"I mean C:\\temp is an invalid path under Windows."
While I'm not disagreeing with that absolute statement,
C:\\temp may be required under a Windows environment.
I came across an example of this fairly recently.
Consider a pp command on cmd.exe something like this (using Strawberry Perl):
C:\some\dir>pp @long_list_of_options.txt -o filename.exe filename.pl
Options (in long_list_of_options.txt) which include paths cannot be written like this for example:
--link=C:\path\to\some.dll
The parts like \X will be interpreted as backslashed escapes:
resulting in just X, or special characters (e.g. newline, tab, and so on).
The example option I showed would end up like:
--link=C:path osome.dll
In order to get it to resolve to the example shown, you'd need to write:
--link=C:\\path\\to\\some.dll
That doesn't mean that an XY Problem doesn't exist; it just shows that it might not exist.
Having said that, the terminal \\\\ certainly looks highly dodgy.
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