Why did "they" code it a different way ?

In a Workstation object if I look in property field "zenimgUploadLocation"
and "zenimgImage" respectivly field with information to file of "Take an
image" and "Put an image"
the first one is "Hex" coded and the second one is "text" coded.

Why such a difference?
I was expecting to create a role in iManager using plugin studio
to let people put or take image exclusivly :...-(