An igw file extension is related to the Interactive Groundwater Modeling (IGW) software for Windows.
IGW file extension - IGW data
What is igw file? How to open igw files?
File type specification:
The igw file extension is associated with the Interactive Groundwater Modeling (IGW), a Microsoft Windows program for unified deterministic and stochastic groundwater modeling.
The igw file contains some kind of data used by IGW.
This igw file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.