2023 Zoner Callisto Metafile 2 Image (Vector) Callisto is a vector graphics editor created by Czech company Zoner Software. This version of the .zmf format is based on Microsoft's OLE2 Compound Document File Format. 1 Digital Preservation Department / The National Archives 20 Aug 2018 This format can be identified via a container signature in DROID version 6 or later. 09 May 2023 fmt/1213 PUID zmf File extension