It's not too unreasonable to assume that a given ancient program would have logic to differentiate between "This is a jpg and I know what to do with it" and "th

It's not too unreasonable to assume that a given ancient program would have logic to differentiate between "This is a jpg and I know what to do with it" and "this is a something else and I don't know what to do with it" so it will technically handle webp images safely while it may not safely handle something that claims to be a jpg but apparently is not.