#TODO: help_string & usage_string:

gui/about.cpp
gui/browser.cpp
gui/chooser.cpp
gui/error.cpp
gui/GuiManager.cpp
gui/KeysDialog.cpp
gui/launcher.cpp
gui/massadd.cpp
gui/options.cpp
gui/saveload.cpp
gui/themebrowser.cpp
gui/ThemeEngine.cpp

base/main.cpp

common/error.cpp

engines/dialogs.cpp
engines/scumm/dialogs.cpp
engines/mohawk/dialogs.cpp

sound/mididrv.cpp

backends/keymapper/remap-dialog.cpp
backends/platform/ds/arm9/source/dsoptions.cpp
backends/platform/iphone/osys_events.cpp
backends/platform/symbian/src/SymbianActions.cpp
backends/platform/symbian/src/SymbianOS.cpp
backends/platform/wii/options.cpp
backends/platform/wince/CEActionsPocket.cpp
backends/platform/wince/CEActionsSmartphone.cpp
backends/platform/wince/CELauncherDialog.cpp