The Control Techniques library "CT 64 Bit Support Library" is, by default, provided with the Machine Control Studio programming system for use with the MC210 Module.
It contains functions to allow read and write access to 64 bit value parameters present on Control Techniques option module range. This library is not supported/required for the drive onboard target.
It is recommended that parameter libraries are always used for interacting with parameters. i.e. CT Unidrive M Parameter Library