Support Python 2.7 and Python 3 winreg imports on Windows

Other_Tools/DRM_Key_Scripts/Adobe_Digital_Editions/adobekey.pyw

@@ -129,7 +129,10 @@ if iswindows:
         c_long, c_ulong
 
     from ctypes.wintypes import LPVOID, DWORD, BOOL
-    import winreg
+    try:
+        import winreg
+    except ImportError:
+        import _winreg as winreg
 
     def _load_crypto_libcrypto():
         from ctypes.util import find_library