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Images: File Extensions

Microsoft File Extensions

FIle Extension File Type
DOC or DOCX Microsoft Word document
PPT or PPTX PowerPoint presentation file
XLS or XLSX Microsoft Excel Spreadsheet
PUB Microsoft Publisher document

Sound File Extensions

File Extension File Type
AIFF or AIF Audio Interchange File Format 
AU Basic Audio
AVI Multimedia Audio/Video
MID or MIDI MIDI Sound
MOV or QT QuickTime Audio/Video
RA RealAudio
WAV Windows Sound

Text File Extensions

File Extension File Type
RTF Rich Text Format
TXT ASCII Text

3D File Extensions

File Extension File Type
STL SteroLithography
GCODE comes for fact that most printing commands start with the letter G

Video File Extensions

FIle Extension File Type
AVI   Audio Video Interleave
FLV Flash Video Format
WMV Windows Media Video
MOV Apple QuickTime Movie
MP4 Moving Pictures Expert Group 4