This file is part of the "Cisco Nexus 1000v" software package for ESXi. To permanently modify it you would need to modify the contents of this package.
I'm sure that this is not supported by Cisco.
Why do you want to edit this file? Is it because of the "Duplicate host UUID" issue that is e.g. referenced here?: https://supportforums.cisco.com/thread/2166139
- Andreas