Hi ,
How can i get access to ( .rc)file when i already load it(already start my program).
I want to make some changes from main window.

Thank you for your effort of reading .

no -- the rc file is compiled and attached to the *.exe. If you need to change one of the resources in it during runtime you will have to make in-memory changes.

For the sake of completeness:
If you are running Linux, you just edit the whatever_config.rc with your favourite text editor (i.e. vim) and send a reload signal to the app.

But on the other hand I have no idea what this 'main window' thingy is ;)

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