The conversion of the file IGS to 3DMAP will allow you to edit a file using other software than before. The conversion IGS to 3DMAP is particularly helpful in cases where you want to give certain features to the data in the IGS file, and all the programs that support the IGS format do not have the possibility to introduce the desired changes.
Just download one of the programs from the list and install it on your computer. After starting the program, select IGS file that you want to convert. Then select the target format (in this case 3DMAP) and follow the instructions. Save the converted 3DMAP file in the selected location. From this moment you can open the 3DMAP file with all the programs that you will find here.