File Extensions Game

[QuadStorm]

.dng - digital negative file
.cr2 - canon raw image file
.webp - google's jpeg/png equivalent
.webm - video file

[Ad Bot]

[Becquerel]

.deb Debian Package
.jar Java file

[Fab]

.big
.sav(e)

[Boink!]

SKP - sketchUp model
ABF - adobe binary screen font

[Steve5451²]

.xcf - GIMP
.html - hyper text markup language for the webs

[Nal]

.pdn paint dot net
.bat (((hacker code only))

[Georges]

yo bro that is more than two.

[BluetoothBoy]

yo bro that is more than two.

Shh I don't think they noticed.

[Cassord²]

CAD File

B^U

[Foxscotch]

.swf (idk it's a Flash thing)
.svg (scalable vector graphics)

[Stick Man]

.nsmv (Native Instruments Massive)
.ksd (Native Instruments Massive)
.flp (FL Studio Project File)

[takato14]

FLAC, you say? I spit on your FLAC. Native formats are the way to go.

.HPS - High-Purity Stream: Native Gamecube PCM Stream (type 1)
.ADX - Native Gamecube PCM Stream (type 2)
.AST - Native Gamecube PCM Stream (type 3)
.ADP - Native Gamecube PCM Stream (type 4)
.DSP - Native Gamecube PCM Stream (type 5)
.CFN - Native Gamecube PCM Stream (type 6)
.MINIUSF - Nintendo 64 song file (contains soundfonts and engine instructions for playback)
.VGM - Sega Genesis song file (contains synth patches and MIDI data)

[Couatl]

.pls (music/audio streaming)
.m3u (music/audio streaming)

[dargereldren]

.svg (scalable vector graphics)

.svgz - gzipped svg

.md - markdown
.mml - music macro language

[the evil corperation]

.ipt (a part file in autodesk inventor)
.iam (an assembly file in autodesk inventor)