You can use the Xfh2btr configuration file to specify the Btrieve open mode used to open a file:
INPUT-EXCLUSIVE:open-mode INPUT-SHAREABLE:open-mode OUTPUT:open-mode EXTEND-EXCLUSIVE:open-mode EXTEND-SHAREABLE:open-mode I-O-EXCLUSIVE:open-mode I-O-SHAREABLE:open-mode
The possible values of open-mode are: normal, accelerated, read-only, verify, exclusive. For further details on these open modes, consult your Btrieve documentation.