*.apkg The .apkg file is a zip file (as you know). Inside, you'll find the collection (an sqlite3 database of notes/cards), the media file which you were trying to open, and a bunch of numbered files 0-whatever number(these are media files). Just use 7zip tool open the apkg file and extract into a folder. open the "media" file via a text editor tool to find the media file extension. example of "media" {"16486": "COCA_16486.mp3", } rename "16486" file to a mp3 file, then you got the media file. how media used in flash card Export your flash cards into a plain text. [sound:COCA_16486.mp3] spatially <div style=''>英['speɪʃəlɪ] 美['speɪʃəlɪ]</div> <div style=''>adv.空间地,存在于空间地;</div> "<div><br /></div><div style='color:RosyBrown'>ADJ</div><div style='color:OrangeRed'>空间的;与空间有关的</div><div style=""font-weigh