Hello,
Yes, of course, and I tried all kinds of things:
I added a path for RT, (system and app) I uninstalled GIMP and reinstalled it in the hope that it would recognize RT during its installation.
I tried your versions from 267 to the last,
I searched the Internet a lot ā¦
Obviously, as I said, it is not of capital importance, but only the interest of a better ergonomics.
@luxapy
It now only works with a dev build. So:
For the first, install a dev build. you recognize it as it has ā_dev_ā in the name
The install dir path can be for instance C:\Program Files\RawTherapee\5.4-298-gbed8e8914
second: put this exact path in the PATH environment variable(user or system as you want)
start GIMP. The plugin is registered during GIMP initialisation
You can also install the successive dev builds in a fixed location as for instance C:\Program Files\Rawtherapee\ dev or whereever you want, such as to avoid mofifying PATH.
I think there is nothing else to try.
Hope this helps and you can use the plugin.
Thank you for your help ,
I do not know if I make a mistake, but it does not work.
Attached are screenshots of the latest RT version, what I found in GIMP and what I put in Path ā¦
Well, do not insist, it does not matter; when I want to use RT with GIMP, I first open RT and pass the result to G.
Itās less convenient, but it works.
It works here on Win10 after adding C:\Program Files\RawTherapee\ to the path.
Parthaās Gimp.
Iām open to keep tryingā¦despite Iām not convincedā¦
No, it doesnāt ok.
I even tried to copy all the files of the RT-5.4.298 directly in the ārawtherapeeā folder without any successā¦
Partha GIMPā¦ partha GIMPā¦ ?! 
Iām using the official GIMP 2.10.0
Here you can get Parthaās builds with some additional goods preinstalled. Like GāMIC, LightZone plugin, and so on.
Iām using his Gimp 2.10/64 standard edition with RT_dev_5.4-298-gbed8e8914_WinVista_64.
Thank you very much ; I will test tonight or tomorrow morning
I was too impatient ā¦
G EN I A L E !!! it works !
thank you very much.
Last question: I did not have time to search; how do you select one of the darktable or RT?
Thanks again.
Just select what you wish in Preferences/Image Import ā¦ and restart the Gimp.
Ok, itās definitely OK and I thank you again.
It was not obvious to me because the bar of choice is almost the same color as the bottom of the screen and Iām rather in a hurry at the momentā¦
I hope my basic question can also help another senile old man like me.
At least you are a sober senile old man. (?)
Oh yes, I am clean on me and very soberā¦
Iāll join this approach tomorrow. Be well!
Ah! I did not think that the GIMP build could be the culprit.
Here I use also Parthaās builds.
Thanks @Jacal
Merci Ć vous pour votre patience et salutations de la part dāun autre vieil homme sĆ©nile 
Ohā¦pas lāair si sĆ©nile que Ƨa gaaned92 !
Oopsā¦ I upgraded together
GIMP (2.10.8) and
RT (5.4-1133-g5e0cbd4c6)
and again, I canāt start RT from GIMP for a RAW file.
Is there a new problem ?
@luxapy
With parthaās GIMP 2.10.8 and last RT dev buid, I am no longer able to sart RT from GIMP.
I will try to investigate.
@agriggio Help! 
Here the RT ticket about automatic registring RT in GIMP: Windows installer: Add Registry entry with full executable path Ā· Issue #4783 Ā· Beep6581/RawTherapee Ā· GitHub
In order to work, you have to install RT with the installer.
I am searching now if GIMP 2.10.8 includes the corresponding modifications. edit : yes
error: Parthaās GIMP is 2.10.6 but it should work
RT path is searched in this order:
1- in environment variable RAWTHERAPEE_EXECUTABLE
2- in registry HKLM section so you have to install for all users
3- in PATH
In 2.10.8 it will be also searched in registry/HKCU
