The file is .vimrc located in
%APPDATA%/RStudio/keybindings/ where you can also find RStudio's JSON
keybinding config files.
See also
rsvim_exec_file() To execute commands from a file.
rsvim_add_command() To append a command to a file.
Examples
if (FALSE) { # \dontrun{
file.edit(rsvim_default_path())
} # }