An FMW file is a project file created with FME Workbench software (comes as part of FME Desktop suite) that is used for spatial data transformation. It contains user defined settings used for spatial data manipulation such as input data sets, translation properties, projections, and output settings. The spatial data manipulation settings are stored as a visual layout and are easy to be edited and saved again.
FMW files are stored to disc as binary files and can be read using the FME Desktop software only. The software can also read data from a number of relational database formats and also supports a range of data formats.