isWindowsRemotePath function
Whether path is a Windows absolute path: C:\…, C:/…, a bare C:,
or a share (\\server\share). A //-prefixed path is not taken as one:
on a POSIX node that is an ordinary absolute path.
Implementation
bool isWindowsRemotePath(String path) =>
RegExp(r'^[A-Za-z]:([\\/]|$)').hasMatch(path) || path.startsWith(r'\\');