QGD - Sqlite Database of the QGIS Project

QGZ - Quantum GIS Compressed Project

S57 - Electronic Navigation Charts File

E00 - ArcInfo Interchange File Format

FileGDB - ESRI File Geodatabase Format

GeoJSON - JSON based Geographic File Format

GML - Geography Markup Language File Format

GPX - GPX Exchange File Format

KML - Keyhole Markup Language

KMZ - KML Zipped File Format

OSM - OpenStreetMap File Format

QGS - QGIS Project File Format

QLR - QGIS Layer Definition File

QML - The QGIS Style File Format

SHP - ESRI Shapefile