Common thing when files arent what they seem (by extension) is to open in hex editor to see if the first 4 characters give any info away.
In this instance, anim_1.jpg is _RAF so its def not a jpg lol...
I simply renamed to .raw and photoshop cs5 detects its width of 1797, height 845... that of course could be very wrong.... I was just my first quick thought haha
I should point out it opens 'fine'....by that i mean theres no wrong extension or cant open this type error but looks like tv static lol
Ill look more into it when I get a chance.. could be another one of sonys special formats like PAMF video files.