XeNTaX

Does somebody know how to unpack and repack these archives?

Usually it helps to attach some examples to work with.

Here are the two smallest .big files from the beta client.

No idea if the retail client uses the same files.

You need map files (eh maybe it is another extension, can't remember) to extract data. There is always data file and index/info file with the same name as *.big one.

Here is the smallest .big + .map file from the MULTI5 (EU) version: http://www.multiupload.com/PIDBXNX3W4

Big files are xored with value "d7 a8 e2 d4"

So it's "easy" to de/recompress or not?

Not so easy, but if you need something really fast, you can decrypt file and look to content ... or wait for unpacker

How can I unpack or at least view the filelist?