All GIS File Extensions
jpg
Joint Photographic Experts Group- lossy graphics file
rar
WinRar Compressed Folder
xls
excel spreadsheet
mxd
arcmap- map document
aux
auxillary file- accompanies the raster in the same location and stores any auxiliary information that cannot be stored in the raster file itself.
sid
compress raster; seamless image database
zip
compressed folder
dbf
database file
doc
document
gdb
geo database
html
hyper text markup language
jgw
jpeg world file- georeferencing information for *.jpg raster maps
kmz
keyhole mark up language zip- placemark file for google earth
kml
keyhole markup language- designed to annotate and overlay visualizations on various two-dimensional, Web-based online maps or three-dimensional Earth browsers (such as Google Earth)
mdb
microsoft database
portable document file
prj
projection file- coordinate system and projection info
rrd
reduced resolution dataset
shp
shapefile
gsg
signature file for image classification
sdf
standard database format files, used for storing structured data
txt
text file
tfw
tiff world file
tiff
uncompressed raster image