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What is an XWI file?
An XWI file is a mission file used by Star Wars: X-Wing, a space combat simulator. It contains data used to load and play a mission. XWI files are paired with corresponding .BRF files, which contain mission briefings.
In 1993, LucasArts published Star Wars: X-Wing, the first in a series of Star Wars-themed space combat games. In the game, players conduct a series of missions that culminate in them playing as Luke Skywalker, piloting his X-Wing in an attempt to destroy the Death Star.
X-Wing's in-game missions are saved as XWI files, stored in the game's MISSION directory. The game loads a corresponding XWI and BRF file when a player begins the related mission.
While not officially supported, players can create custom XWI (and corresponding BRF) files using X-Wing Mission Builder, a custom mission creation tool. X-Wing Mission Builder also contains template custom mission files, which players can open, examine, modify, and play.
How to open an XWI file
You can open and modify an XWI file using X-Wing Mission Builder. To do so, select File → Open from the program's menu bar (or push F3). Then, navigate to and open your XWI file.