os.putEnv limited to application's scope?

[deooo]

Hi there, I would like to permanently store some data in environment variables. 
I'm running the code with nim-0.17.2 on windows, and I'm fine storing data as 
user environment variables.

The data is not visible outside of the nim application, and it's not available 
when I run the program for the second time. Is there something I need to know 
about os.putEnv? How do I permanently store an environment variable?
    
    
    import os
    
    var name = "name"
    var value = "value"
    echo "Currently: " & os.getEnv(name)
    echo "Set " & name & " to " & value
    os.putEnv(name, value)
    echo "Got: " & os.getEnv(name)
    
    
    
    > nim c -r repro.nim
    ...
    Currently:
    Set name to value
    Got: value
    > nim c -r repro.nim
    ...
    Currently:
    Set name to value
    Got: value
    

btw, I get the same result when I replace every os with ospaths