I have a raster in ESRI Grid format and am trying to view the attribute table in my student version of ArcMap 10.5. I know this raster has fields attached to it because I am able to view the attribute table on another machine running ArcMap 10.5.1 (see attached screenshot). However, on my machine, when I right click the raster in Table of Contents, the option to Open Attribute Table is grayed out. I have Spatial Analyst enabled on my machine, but is there some other setting I should look into, or a restriction with my student license? My ultimate goal is to use the Lookup Tool to produce rasters based on the attribute fields, which I was able to do successfully on the other machine. I have the exact same files for the raster on my machine.