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Apple has some guidelines where to store your configuration file and where to store application data, which is conflicting with the Lazarus GetAppConfigDir or GetAppConfigFile functies.
These functions assume:
~/.config/<appname>
Which is incorrect according to Apple guidelines ... and will result in errors that a file cannot be written etc.
Config files and data files (not documents!) should be stored in:
~/Library/Preferences/<your config file>
You can expand the full path with:
ExpandFileName('~/Library/Preferences/<your config file>');
Note that the config file should go here as well, which is typically an XML file with the .plist extension.
But you can of course also use your own format 