Beginning in version 12.4 Update 1 (12.4.1), Management and Security Server generates keystores using the .bcfks (bouncy castle fips keystore) extension. The BCFKS store type was developed by Bouncy Castle to be FIPS Compliant.
MSS can still import PKCS#12 keystores, including files with these extensions:
.p12 files, processed by the RSA BSAFE JCE provider JsafeJCE
.pfx files, maintained by the Baltimore/ASCJ provider ASCJ