Postgres service not starting on windows after install if not installed into standard locations

Hi!

Had installed PostgreSQL 16.5 on Windows 10:

Install directory: "C:\PRGS\pgSQL\16"
DB-Directory: "C:\DB\pgSQL\16\data"

Environment variable "PGDATA" is set to "C:\DB\pgSQL\16\data".

Initialized the database. Then started postgres services using:

c:\PRGS\pgSQL\16\bin\pg_ctl.exe start

Worked nice. Server starts, the serves as expected. But: if I try to
start the service by "net start pgSQL" I am reported that "pg_ctl.exe"
could not find "postgres.exe".

What I've tried:
- added environment variable "PGPATH" pointing to "C:\PRGS\pgSQL\16\bin"
-> did not help.

- added "C:\PRGS\pgSQL\16\bin" to path. -> did not help either, even
after rebooting. I've added it to system path.

Are paths somewhere within some configuration file or registry entry?
And set to standard install locations?

Any idea is welcome to solve this problem!

--
Thomas