How to modify BIND default files to *.db from the *.hosts default ???

How do I make Webmin create new zones by default with a .db extension - that is modify BIND default files to *.db from the *.hosts default ???

SOLVED - it is at Webmin -> Servers -> BIND DNS Server -> Module Config -> Zone file options -> Format for the name of forward zone files. “Module Config” is the little gear icon in the top left corner left of the “BIND DNS Server” title at the top [per as answered by author - J. Cameron and put here for benefit of others searching for same in the future]