I finally wrote it just like this:

  my $command = "C:\\Windows\\system32\\runas.exe /user:ctldomain\\$us
+er \"c:\\Program Files\\Internet Explorer\\iexplore.exe \"c:\"";

  system($command) or print "error running command: $!\n" and exit;

[download]

But i have to reconsider using a list as suggested by you and others.

In reply to Re^2: System command with quotes and variables by mellin
in thread System command with quotes and variables by mellin

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