builder/amazon: don't chmod on windows

builder/amazon/common/step_key_pair.go

@@ -9,6 +9,7 @@ import (
 	"github.com/mitchellh/packer/packer"
 	"log"
 	"os"
+	"runtime"
 )
 
 type StepKeyPair struct {
@@ -56,11 +57,13 @@ func (s *StepKeyPair) Run(state map[string]interface{}) multistep.StepAction {
 		}
 
 		// Chmod it so that it is SSH ready
+		if runtime.GOOS != "windows" {
 			if err := f.Chmod(0600); err != nil {
 				state["error"] = fmt.Errorf("Error setting permissions of debug key: %s", err)
 				return multistep.ActionHalt
 			}
 		}
+	}
 
 	return multistep.ActionContinue
 }