.iml

Module file used by IntelliJ IDEA, a Java IDE (Integrated Development Environment); may contain references to sources, javadocs, and other files used by a program; typically referenced in the source code of an IntelliJ IDEA program.

IML files can be created by the developer or automatically generated by the IntelliJ program. They can also be generated by third-party programs such as Maven with the IDEA plugin (using the "idea:module" function).