The location of the platform configuration file depends on which operating system the platform is using.
For z/OS, the default configuration file for the Platform Services Process is member ASCPRM00 in the partitioned data set allocated to the ASCPARMS ddname. The default configuration file for the Platform Receiver is the z/OS sequential data set or partitioned data set member allocated to ddname ASAMCONF. You can use a JCL EXEC statement PARM to specify a different configuration file.