Guideline - Programming guidelines
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All OpenAmiga GUI components must use the GUI toolkit that Hyperion has selected as standard for OS4 components. Currently that means using the Reaction/BOOPSI GUI toolkit.
Default GUI data
All applications and tools shall store information such as the last used path for opening or saving files where applicable and restore it when the user comes back to the related functionality. The application.library has functionality that supports this behavior. See the Default application data manager project for more information.
Do not use deprecated functions
When dealing with files, make sure you use 64bit aware functions and that your code can handle it