Generally if a file format is not supported you should get an error message. Elements will do that. Any mainstream application should do that also. btw Elements will let you edit jpg somewhat in the RAW editor and let you adjust white balance (as much as it can using File, Open As..). I have the local version (perpetual) that comes with Premiere for video editing though I don't use it but it's older. It appears Elements still offers pertual licenses but if that is what you want, make sure it says so. The pices seems to reflect perpetual licenses (for example $79.99 versus a smaller monthly fee).
If Sealife truly uses Adobe DNG as they say then Elements should have no issues opening and providing full functionality.
If Sealife truly uses Adobe DNG as they say then Elements should have no issues opening and providing full functionality.