On Windows environment, the postgres-reg.ini file is not created, but entery for XDB is registered in below location. However to find the registry details, you could find them from regedit.
1) Open Run
2) Type regedit
3) Go to HKEY_LOCAL_MACHINE
4)Go to SOFTWARE
5) Go to Wow6432Node
6) Go to EnterpriseDB
7) Right click on xDB Replication Server and click on delete.
Once the above steps are done. You can install xDB again.
You can use configuring xDB replication with standard postgresql installation as well.
Hope this helps you.
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