Casio V-REGI series Programming And Reference Manual page 112

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If Reload or Reload all detect version unmatch between
backup data and current APP, it may be shown confirmation
dialog for update database.
There are three backup file format.
 CRX is used for PC tool with XML style format.
 DB format is same as SQLite file it's self. If you have SQLite
tool on PC, you can use DB file for check data or update
data.
 Dump format is database SQL dump text data. You can see
data directory with text editor.