Note that access to the files hosted on Xentax is granted upon paying of 5$, same if you want to post.
Currently the biggest and oldest forum about file format reversing, I registered there in 2009 when I started my QuickBMS project.
Most of the research there has been performed by people like Ekey, Alpha23, chrrox, Rick, MrAdults, finale00 and some others... oh and me obviously
There are many restrictions regarding the links to the sample files, the things to discuss and so on.
It's quite normal to have the own posts edited or deleted.