hm - so I just added the .jpeg extension to the file and was able to view the image. ugh - this likely means I cp'd one file of the directory (i was copying from) to the Ext_Art file name thinking it was already created as a directory. Or something like that. Either way, it appears as a...
@Fiddlestix - did you ever conclude the issue? I ran into a similar problem (noticed after upgrade to El Cap).
Still working on a solution but here is some info I found on the file/directory conversion:
1. The external HD is in fact formatted as Mac OS Extended:
$ diskutil info...