CATIA CAD software supports IGES format (.igs, .iges) just fine and can process the data for making new parts (.catpart). If you do not have access to CATIA, then you have to use some kind of other CAD program with CATIA's file type support, or some dedicated CAD / 3D model conversion solution.
Convert IGES 3D exchange format to CATIA part data.
We have found 2 software records in our database eligible for .iges to .catpart file format conversion.
Microsoft Windows software - convert iges to catpart on Windows
A dedicated CAD converter with a large file format support that allows users to convert (translate) CAD designs or drawings between different formats. CrossManager is a commercial product, you will need to purchase a license. It is available in English, French, German, Italian, Czech, Chinese, Russian and Korean language.
Convert from iges file
to catpart file
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned iges to catpart. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
EnSuite represents tools for visualization, analyzing and sharing of CAD data.