Not able to read a JP2 file

I download this app because it is supposed to read JP2 files. The truth is that File Viewer is actually NOT able to read such files. Exif tags are correctly read (great any exif-based tool is able to do so). But displaying a JP2 is out of the capability of this app. To bad, I’m gonna remove it right now.

Adakite about File Viewer, v1.4