CAD Files Extensions - What are cad files and how do I open a cad file?

What are cad files and how do I open a cad file?

File Type Category File Format
.123dx CAD Files 123D Design Model File
.bbp CAD Files Bézier Surface file
.catpart CAD Files CATIA V5 Part File
.cdw CAD Files KOMPAS Document
.cgr CAD Files CATIA Graphical Representation File
.dgk CAD Files Delcam 3D Model File
.dgn CAD Files MicroStation Design File
.drwdot CAD Files SolidWorks Drawing Template
.dwfx CAD Files Design Web Format XPS File
.dwg CAD Files AutoCAD Drawing Database File
.dws CAD Files AutoCAD Drawing Standards File
.dxf CAD Files Drawing Exchange Format File
.easm CAD Files eDrawings Assembly File
.ezp CAD Files AutoCAD Ecscad Project Backup File
.fmz CAD Files Form•Z Project File
.fpd CAD Files Front Panel Designer Project
.fzz CAD Files Fritzing Shareable Project File
.gbx CAD Files Gerber PCB File
.igs CAD Files IGES Drawing File
.ipt CAD Files Inventor Part File
.jam CAD Files Jam STAPL File
.lcf CAD Files ArchiCAD Library Container File
.ldt CAD Files Eulumdat Formatted Luminaire Data File
.lyc CAD Files bestIMAGE Compressed Design File
.nc CAD Files Mastercam Numerical Control File
.pipe CAD Files PIPE-FLO Project File
.pla CAD Files ArchiCAD Project Archive
.pln CAD Files ArchiCAD Project File
.prt CAD Files Pro/ENGINEER Part File
.qpm CAD Files Quick Pallet Maker Input Data
.rs CAD Files RapidSketch Document
.rtd CAD Files Robot Structural Analysis Design File
.sab CAD Files ACIS SAB Model File
.scad CAD Files OpenSCAD Script
.shx CAD Files AutoCAD Compiled Shape File
.stl CAD Files Stereolithography File
.top CAD Files TopSolid Design Document
.vtf CAD Files Valve Texture File
.vwx CAD Files Vectorworks Design File