bash does not recognize valid windows path: `bash: 'c:\windows\system32\cmd.exe' /c echo 123: command not found`

[Andry via cygwin]

If try to replace it by:

'c:/windows\system32\cmd.exe' /c echo 123

Then all works fine.
I've checked it in the old 1.5.x version and seems this bug is there for ages.


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