Jack K already answered this but I want to add few details regarding IGS file import within CATIA V5.

Here are some additional things to keep in mind when scaling IGS files and other file types in CATIA:

* The scaling factor can be a positive or negative number. A positive number will enlarge the geometry, while a negative number will reverse the geometry orientation.
* The scaling factor can be applied to all three axes (X, Y, and Z) (Using the Affinity feature, not the Scale feature), or it can be applied to a single axis.
* If you are scaling a surface, you can also specify the Scaling method. The default method is Uniform, which scales the surface equally in all directions. You can also choose the Non-uniform method, which allows you to scale the surface differently in each direction.

I will also create a video regarding this as this is a great topic!

Of course you can scale in CATIA.

Open the .igs file in CATIA first. It's probably surface data, so use the GSD workbench. The SCALING command will will let you change the size of the surfaces or other geometry. (see second picture)

If you have a solid model, use the SCALING command in the Part design workbench . (see first picture)