Os arquivos apkg contêm um arquivo de banco de dados sqlite incorporado. Por exemplo, o baralho Capitais da América do Sul é baixado como Capital_Cities_of_South_America.apkg, que na verdade é um arquivo zip. Descompactar isso irá extrair vários arquivos
$ unzip ../Capital_Cities_of_South_America.apkg
Archive: ../Capital_Cities_of_South_America.apkg
inflating: collection.anki2
extracting: 0
extracting: 1
extracting: 2
extracting: 3
extracting: 4
extracting: 5
extracting: 6
extracting: 7
extracting: 8
extracting: 9
extracting: 10
extracting: 11
inflating: media
$
mas o interessante é o collection.anki2, que é um arquivo sqlite.
$ sqlite3 collection.anki2
SQLite version 3.13.0 2016-05-18 10:57:30
Enter ".help" for usage hints.
sqlite> .tables
cards col graves notes revlog
sqlite> .dump notes
PRAGMA foreign_keys=OFF;
BEGIN TRANSACTION;
CREATE TABLE notes (
id integer primary key, /* 0 */
guid text not null, /* 1 */
mid integer not null, /* 2 */
mod integer not null, /* 3 */
usn integer not null, /* 4 */
tags text not null, /* 5 */
flds text not null, /* 6 */
sfld integer not null, /* 7 */
csum integer not null, /* 8 */
flags integer not null, /* 9 */
data text not null /* 10 */
);
INSERT INTO "notes" VALUES(1475868715241,'P1Dh$4r;;P',1475850444584,1476205558,13,' South_America capitals ','Capital of French Guiana?Cayenne<div><br /></div><div><img src="053_Hood_135.jpg" /></div>','Capital of French Guiana?',511387741,0,'');
INSERT INTO "notes" VALUES(1476020723949,'D3h>i:~1(}',1475850444584,1476205484,13,' South_America capitals ','Capital of Brazil?Brasilia<div><br /></div><div><img src="brasilia-006.jpg" /></div>','Capital of Brazil?',139249191,0,'');
INSERT INTO "notes" VALUES(1476020740304,'I=w5}{qq&z',1475850444584,1476021426,4,' South_America capitals ','Capital of Argentina?Buenos Aires','Capital of Argentina?',4279953785,0,'');
INSERT INTO "notes" VALUES(1476020761836,'PpW<QQ2n;<',1475850444584,1476205269,13,' South_America capitals ','Capital of Chile?Santiago<div><br /></div><div><img src="santiago.jpg" /><br /><div><br /></div><div><br /></div></div>','Capital of Chile?',857145718,0,'');
INSERT INTO "notes" VALUES(1476020893034,'AQILm-om{w',1475850444584,1476205286,13,' South_America capitals ','Capital of Suriname?Paramaribo<div><br /></div><div><img src="paste-68513318306560.jpg" /><br /><div><br /></div><div><br /></div></div>','Capital of Suriname?',3475624840,0,'');
INSERT INTO "notes" VALUES(1476021133011,'ssX|ur}vz;',1475850444584,1476205460,13,' South_America capitals ','Capital of Guyana?Georgetown<div><br /></div><div><img src="georgetown-guyana.jpg" /></div>','Capital of Guyana?',1383243232,0,'');
INSERT INTO "notes" VALUES(1476021159549,'d_}(&UOcN0',1475850444584,1476205474,13,' South_America capitals ','Capital of Venezuela?Caracas<div><br /></div><div><img src="CaracasAvila.jpg" /></div>','Capital of Venezuela?',3460219780,0,'');
INSERT INTO "notes" VALUES(1476021305082,'hF6^dUFOU_',1475850444584,1476205202,13,' South_America capitals ','Capital of Colombia?Bagota<div><br /></div><div><!--anki--><img src="asuncion-paraguay.jpg" /></div>','Capital of Colombia?',3745298320,0,'');
INSERT INTO "notes" VALUES(1476021329578,'BF<CKCw&@X',1475850444584,1476021353,4,' South_America capitals ','Capital of Ecuador?Quito','Capital of Ecuador?',93805795,0,'');
INSERT INTO "notes" VALUES(1476021353212,'s-x)P3;UJ+',1475850444584,1476205337,13,' South_America capitals ','Capital of Peru?Lima<div><br /></div><div><img src="lima-miraflores-rw.jpg" /></div>','Capital of Peru?',1899195448,0,'');
INSERT INTO "notes" VALUES(1476021369814,'p~,SBD&um#',1475850444584,1476205352,13,' South_America capitals ','Capital of Bolivia?La Paz<div><br /></div><div><img src="La_Paz_Skyline.jpg" /></div>','Capital of Bolivia?',2475357406,0,'');
INSERT INTO "notes" VALUES(1476021495601,'h(+l3fJs48',1475850444584,1476205311,13,' South_America capitals ','Capital of Uruguay?Montevideo<div><br /></div><div><img src="montevideo-uruguay.jpg" /></div><div><br /></div><div>[sound:rec1476205311.mp3]</div>','Capital of Uruguay?',3423412928,0,'');
INSERT INTO "notes" VALUES(1476021520017,'g[QWvAO[:]',1475850444584,1476205181,13,' South_America capitals ','Capital of Paraguay?Asuncion<div><br /></div><div><img src="asuncion-paraguay.jpg" /></div><div><br /></div><div>[sound:rec1476205181.mp3]</div>','Capital of Paraguay?',3088135100,0,'');
CREATE INDEX ix_notes_usn on notes (usn);
CREATE INDEX ix_notes_csum on notes (csum);
COMMIT;
sqlite>
Neste ponto, você está livre para atualizar as entradas com comandos sql padrão.