FME considers a dataset to be a folder name.
The name of the INGR output file written to the output dataset folder is determined by the interpretation type of the raster. If the raster contains colour bands, it will be written to a .rgb file. If the raster contains a band with a palette, it will be written to a .cot file. If the raster is numeric, it will be written to a .grd file.
Workbench Writer Parameters
This format does not contain format-specific writer-level parameters.