from osgeo import gdal ds = gdal.Open('file.rst') array = ds.ReadAsArray()

You cannot legally download Idrisi Selva from a torrent or a crack site. Doing so exposes you to:

Instead, she remembered that IDRISI Selva was renamed TerrSet in 2015. Searching for “TerrSet geospatial monitoring system” got her to the right page.