In that case try using the full path to telnet.exe, for example:
system('C:/Windows/system32/telnet.exe', 'x.x.x.x');
print "$? $!\n";

[download]

In reply to Re^3: Error calling system(telnet x.x.x.x) by cdarke
in thread Error calling system(telnet x.x.x.x) by SuperSu

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