Currently the 'Configurations' are stored in the. What is an IWS file? Dynamic Web page created with IntelliJ IDEA, a Java IDE ( Integrated Development Environment); when accessed by a user, the Java syntax. The IWS file type is primarily associated with Information Workshop by BlackCat. The scenario: You have a file with the IWS file extension on your computer that you need to open. IWS stands for IntelliJ IDEA Web Page.