The BTRPAGE environment variable specifies the page size that is used when Btrieve files are created. You can set it using the following command:
set BTRPAGE=nnn
where nnn is a byte value in the range 512 to 4096 inclusive, in multiples of 512 bytes. The value must be greater than the record size.
If you do not set BTRPAGE, or you specify a wrong value, the page size defaults to 1024 bytes.