If you are seeking information about file extensions, then you are in the right place at right time.

Document File Extensions

ExtensionsAssociations
!wsWordStar 2000 Temporary File
1Unix Manual Page
123Lotus 123 Spreadsheet
123cAutodesk 123C Drawing
123dAutodesk 123D Drawing
123dxAutodesk 123D Design Model
12mLotus 1-2-3 Smartmaster Template
1spMicrosoft OneNote 2010 Mobile Document
1stReadme Document
2Unix Manual Page
2cdDoubleCAD Document
2dCadwork 2D Drawing
2dVersaCAD 2D Drawing
2dcCadwork 2D Drawing
2dlArchiCAD 2D Lines Data
3Unix Manual Page
3dCadwork 3D Drawing
3dCAD-3D Model
3d2CAD-3D Model
3daArtCAM Pro 3D Assembly File
3db3DMark Report Database
3dcCadwork 3D Drawing
3ddCadmatic 3DD Model
3dfInformative Graphics 3D Format Document
3dg3D Grapher Document
3diCadence Allegro 3D Model
3dlLightConverse 3D Scene
3dmOpenNURBS 3D Model
3dmfQuickDraw 3D Metafile
3dmlFlatland 3DML Document
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