GUI for the "file" command

Caja shows file "type" based on the extension at the end of the filename, both when listing files in a directory or in "properties" of a file. Is there a way only using the graphical interface to check the contents for the file with the file command? Asking because my aunt is using xsane to scan photos, and it seems that it does not automatically adjust the file name to the selected type, so she did not understand why she couldn't see a number of photos in gthumb, which I found using the file command in terminal were actually PDF files.