Version 9 of FairCom DB introduced extended headers for all newly created files by default. Previously, this mode was only enabled with calls from an Xtd8 specific function and defining the XCREblk structure.
The advantage of this new approach is that 6-byte transaction numbers are used by default, which avoids potential unexpected transaction number overflows, or in some cases, encountering error R6BT_ERR (745, 6BTRAN file required).
This feature can be disabled with the following keyword should this be necessary for backward compatibility:
Standalone applications can disable this support by setting the cth6flg global variable to any non-zero value.