You should not edit the lrs file directly. But try this:Lazarus main menu > Project Options > left panel: Project Options > ResourcesThere you can add and remove the resources.These are the documentations:https://wiki.freepascal.org/Lazarus_Resourceshttps://www.freepascal.org/docs-html/rtl/classes/tresourcestream.htmlIn the section "File handling" in the link below has a demo how to use it:https://wiki.freepascal.org/Portal:HowTo_Demos