Files with hcm extension are used by IBM HCM software. They include log files data.
HCM file extension - IBM HCM ork file
What is hcm file? How to open hcm files?
File type specification:
The hcm file extension is related to IBM HCM (Hardware Configuration Manager) and used for its work files.
The z/OS and z/VM Hardware Configuration Manager (HCM) is a PC based client/server interface to HCD that combines the logical and physical aspects of hardware configuration management