A file with .igs (Initial Graphics Exchange) extension is a 2D-3D design exchange file format that is independent of source or destination file format specifications used by CAD applications. It is used to exchange design information about circuit diagrams, wireframes, the freeform surfaces between two independent systems. IGS files can be opened by applications such as Autodesk, FreeCAD, CADEX CAD Exchanger, and other similar applications.
A file with .svgz extension is a compressed version of Scalable Vector Graphics (.SVG) file. It is compressed with gzip compression and contains data in XML format. SVGZ files support transparency, gradients, animations, and filters. SVGZ files are smaller in size as compared to the default SVG files and this reduced file size helps transfer the graphics files.
You can also convert IGS into many other file formats. Please see the complete list below.