Setting to enlarge the thumbnail size?

[frankreid]

I often use the thumbnails in the File>Open to look at each drawing in a folder. By using the down arrow key I can move through many drawings. It would help if I could increase the thumbnail size like you can in Explorer. I looked through all the settings in Tools>Options and also used regedit to search the registry for AUTOCADLTThumbnail besides just thumbnail and Autocad but was not able to find it. Does anyone know where the setting is located?
Thanks

Frank Reid
Reid Engineering Services of Utah