That works - thanks ! ``` sqlite> .version SQLite 3.36.0 2021-06-18 18:36:39 5c9a6c06871cb9fe42814af9c039eb6da5427a6ec28f187af7ebfb62eafa66e5 zlib version 1.2.11 gcc-5.2.0 sqlite> attach database "file:reference.db?mode=ro" as reference; sqlite> PRAGMA database_list; 0|main| 2|reference|C:\Users\[...]\reference.db sqlite> .tables reference.x sqlite> drop table reference.x; Error: attempt to write a readonly database ```