.AAO File Extension

Map file used by America's Army (AA), a multi-player shooter game released by the US Army; contains a game map, including terrain, buildings, and other objects; used to create and share custom maps.

AAO files are stored in the Maps directory of an AA installation.

File created by Agenda At Once, a Personal Information Manager (PIM) that helps users manage their To-Do lists; contains tasks, notes, calendars, contacts, deadlines, and percentages complete; used to store personal reminders and organize personal schedules.