2063 ZFO (Proof of Delivery) File Aggregate This variant of ZFO file is container for proof of delivery of data mailbox messages provided by Česká pošta, s.p. in three versions: 1. proof of delivery; 2. confirmation of delivery; 3. delivery failure. ZFO file is a ZIP archive file (PKCS #7 Cryptographic Message File) composing of the layout structure using XML elements. The whole structure is always embedded into a digital signature represented by XML elements of the XML Signature standard. 242 The National Archives of the Czech Republic / The National Archives of the Czech Republic 18 Jan 2020 18 Jan 2020 application/vnd.software602.filler.form-xml-zip MIME fmt/1245 PUID zfo File extension 1622 ZFO (Proof of Delivery) File Magic bytes: http://isds.czechpoint.cz/v20/delivery 1 Absolute from BOF 0 20500 687474703A2F2F697364732E637A656368706F696E742E637A2F7632302F64656C6976657279 Has priority over 1469 PKCS #7 Cryptographic Message File