If you know the path of a file that exists in the instance's install directory, how can that file be opened and edited in Studio? This file is not saved under the visible directories in Studio ex csp or mgr. For example if you have no access to the server operating system command line, how would you be able to modify a file using Studio?
in Studio in the Output panel you can execute COS commands.
Copy the file you need to the CSP directory. For example for Windows:
write $zf(-1,"copy g:\readme.txt c:\InterSystems\IRIS\CSP\aaa\readme2.txt")
After editing, copy it back.
Or another way, create a new application with the file storage you need.