war_yan_a.rar

any one know how to open it and use it ? 

 

Try to decompress with offzip http://aluigi.altervista.org/mytoolz/offzip.zip

offzip.exe -a war_yan_a.x

You should get 2 files out of this sample.
Also after decompressingg this doesn't look like graphics data, more like 3D model data.

.x could be DirectX 3D format

@Sparagasno, definitely seems to be a custom format just from a check of the header:

That URL at the very top is the website for the dev of 300 Heroes.

Using hex2obj