.YFS File Extension
YSFLIGHT Mission File
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What is a YFS file?
Game file used by YSFLIGHT, a free, cross-platform flight simulation game; stored in plain text and contains properties for mission obstacles and objectives; can specify enemy aircraft, starting positions, weather conditions, and other factors.
Several YFS files are included with the YSFLIGHT installation within the /missions/ directory. Custom missions can be created using the YSFLIGHT Scenery Editor.