Decode Shell Extension - Version 4.3 This extension for Windows Explorer provides a subset of the decoding features available in our Directory Toolkit product. It allows you to decode a file containing Base64 (MIME), UUENCODED, XXENCODED, BinHex (Mac format), XXENCODED, and User (table) encoded attachments(s) by right-clicking on the file in Windows Explorer and selecting Decode from the menu.