Intersystems IRIS Data Platform cant change default password

I am currently testing the docker container for the InterSystems IRIS Data Platform. I want to change the default password with this line (from dockerhub instruction: https://hub.docker.com/_/intersystems-iris-data-platform/plans/222f869e-567c-4928-b572-eb6a29706fbd?tab=instructions):

 docker run --name my-iris -d --publish 9091:51773 --publish 9092:52773 --volume /home/user1/:/durable store/intersystems/iris-community:2020.2.0.204.0 --password-file /durable/password/password.txt 

My path to password is: C:Usersuser1DesktopTestDockerProjektwarenverwaltungcontainerIRISDataPlatformpasswordpassword.txt

It says that I must use the absolute path, but i am not that comfortable what exactly is the absolute path. I tried:

docker run --name my-iris -d --publish 9091:51773 --publish 9092:52773 --volume /container/IRISDataPlatform/password/:/durable 92ecaf86671c --password-file /durable/password.txt 

But in Docker Desktop I see that the container was exited with the error:

[INFO] Changing InterSystems IRIS password…

[ERROR] 20200630-10:05:56:906696500 Error: Password file
‘/durable/password.txt’ not found

[ERROR] Command "changePassword.sh /durable/password.txt" exited with
status 256

[FATAL] Error changing InterSystems IRIS password

Info: I created an image via Dockerfile, so 92ecaf is my Image ID. It is exactly the same like store/intersystems/iris-community:2020.2.0.204.0. The image was build in the directory:
"C:Usersuser1DesktopTestDockerProjektwarenverwaltung"

Source: StackOverflow