since default_filename will be null at opening(code set default_filename only at save), setting filePath with default_filename will raise exception. Fixed by setting filePath, basename only at save(since two vars only used at creating nameFieldStringValue) and setting directory with initial_directory at opening.
Source directory structure
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audio
Contains files for mixing and playing music and sound.
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drawing
Low level drawing logic and palette tables.
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interface
Window and widget logic, includes high level drawing and input.
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localisation
String IDs, currency and date logic.
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network
Network and multiplayer logic, includes management of network games and downloading / uploading of content.
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management
Park management logic such as finance, marketing and research.
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peep
Guest and staff definitions and logic such as action management and pathfinding.
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platform
Compiler and operating system specific code such as type definitions, message handling and file input / output.
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ride
Data and logic for rides, vehicles and track.
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util
Utility and helper functions.
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windows
Definitions and logic for all the windows in the game.
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world
World objects and mechanics such as the climate, landscape, sprites and park.