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The source code editor auto-saves files to disk every few seconds. The auto-save files are placed in a subdirectory of your Cache Directory.

If Wing ever crashes or is killed from the outside, it will check this directory when it is restarted and will offer to restore unsaved changes. The files you select to restore will be opened into Wing as edited files.

To keep the restored unsaved changes, save the file to disk.

To discard unsaved changes, use Revert to Disk in the File menu.

In Wing Pro you can compare the restored files to disk using Compare Buffer with Disk item in the Difference/Merge toolbar item or Source > Difference/Merge menu area.