How to convert ChessBase format files to .pgn? While downloading some games I came across some files in ChessBase format:


.cbv
.cbf
.cbh


I would like to know if is is possible to convert these files to .pgn format without using proprietary software and how it can be made.
Well since the protocols creating cbv, cbf and cbh formats are not made publicly available, one will certainly not find any such conversion tool (i.e. unclear how they are encoded to reverse them to pgn).

Other reason maybe that the difference between all these formats is just due to an "incremental encoding" that is being used, which means that for it to be possible to go backward, to a pgn format, only the chessbase engine can do so!

Until a way around this is found, you can use playchess free program or easier the chessbase light (which is free), where using 

choose file->new database and create pgn files 

will allow you to obtain pgn formats again.