Sorry but *.grn is undocumented. Its commercial from RAD Game Tools.
There already exists a Grannyviewer included in our Iris1 Dev. Framework (a bit outdated):
http://prdownload.berlios.de/iris/Iris_ ... rk-0.4.zip
or checkout the latest Grannyviewer Sourcecode from:
http://svn.berlios.de/svnroot/repos/iri ... nnyViewer/
http://developer.berlios.de/svn/?group_id=2777
I hope this helps you.
Why do you want to code another Grannyviewer, when there already exists one ???
You can also view all animations and grannys using the Debugmode of Iris2 !!
Sorry but i find this useless and a waste of time.
Better write an Import/Export tool.