If you are looking for a specific post, it might be part of a technical deep-dive into or a troubleshooting guide for specialized industrial or financial software. Are you trying to register this file on a newer system, or Unitronics- Programmable Logic Controller + Built-in HMI
C:\Windows\SysWOW64\regsvr32.exe C:\path\to\your\fast2001.ocx fast2001.ocx