Dozens of different .art files exist and many of them are graphics files, so in this sense one or more types of art to bmp conversion is possible. Most ART graphics formats are actually vectors, but BMP format is raster, so the resulting file will be just that, a bitmap picture.
The most important thing thus will be to identify the particular type of ART format you have, to pick the appropriate software for the export.
Updated: September 27, 2023