Import Error: YDD from RDR2

[Cerlane]

Hi!
It's my first time working with ZModeler and I tried to import a YDD-File from the game RDR2. I want to edit the hair from the horses (make them longer, curly).
But I always get this:
"Invalid file signature. file:opensaveservice.cpp line:994"

What does this mean?

[Oleg]

You are trying to Open file instead of Importing it.
I doubt ZModeler will import .ydd file from RDR2 as format inside the file could be different.