Update win-python-builder.psm1

builders/win-python-builder.psm1

@@ -60,8 +60,11 @@ class WinPythonBuilder : PythonBuilder {
             } else {
                 $ArchitectureExtension = ".amd64"
             }
+        }elseif ($this.Architecture -eq "arm64") {
+                $ArchitectureExtension = "-arm64"
         }
 
+
         return $ArchitectureExtension
     }