This morning when I opened my .mxd (ArcGIS version 10.2.2) several shapefiles were not showing in the data view window or selectable. Zoom to layer also did not work. The attributes of the shapefile are not missing and no error message was shown. But when I checked the shapefile data I noticed that the .xml files were missing of these shapefiles.
I tried this 'how to recover a corrupt data file': http://support.esri.com/en/technical-article/000007161
After trying option nr 6, I can now open the shapefile in QGIS, but the GCS is way off. Does somebody know how to fix this?