I am using gvim. I have checked the location of the RUNTIMEFILE with :echo $RUNTIMEFILE and found that is is located in c:\Programme\vim\vim82.
The file _gvimrc is there indeed. However, I do not have administrator privileges and I cannot write to this directory.
I would prefer to have my _gvimrc in a different directory. I do not find a way of ensuring that gvim finds my personal _gvimrc.
I may ask the administrator once to set a PATH, but I cannot expect continuous support for every edit of _gvimrc.
I have seen many related questions, but none is addressing the issue of no-access to the directory vim82.