Help with chessbase file

I asked this in the chess forum,thought I'd try in general as well,maybe I get more respone here.
How do I open a 'chessbase compressed database'??
It does not open in chessbase,I assume I need to decompress it first.But how?
The file looks like a chessbase icon,with a square around it,and arrows on all four sides of the square.

Hmmm. The archive should open when you double-click the icon. Chessbase 8 starts automatically and the database opens. Maybe the file is corrupted.

Originally posted by CeeWinM
Hmmm. The archive should open when you double-click the icon. Chessbase 8 starts automatically and the database opens. Maybe the file is corrupted.