This is part of the Fake.Installer.Wix module.

RegistryValueAction

The action that will be taken for a registry value

Union Cases

Union CaseDescription
Append
Signature:

Appends the specified value(s) to a multiString registry value
Prepend
Signature:

Prepends the specified value(s) to a multiString registry value
Write
Signature:

Writes a registry value