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# Convert Application Tables File

All xxTB files must be converted to allow for an 8-character table ID if the tables were used on systems prior to version 5.0x. The 8-character table ID is the primary key of the file, and is necessary to allow for the 3-character company ID in company-specific tables. In addition, logic in your programs must also be adjusted to specify the 3-character ID when reading a company-specific table, or to use 3 spaces instead of 1 when reading nonspecific tables.