ocr: Extension Description .DB Table definition and all data except memo, graphic, and BLOb fields. MB Memo, graphic, and BLOb data. PX The index for the table's primary key. Xnn and .Ynn Each pair of files represents a separate secondary index. The naming convention for nn will be explained in the third article of this series. VAL ValCheck, Table Lookup, and Reterential Integrity detinitions. Figure 1: Paradox file format extensions.
