In revision r906 I've implemented a feature request: write support of PGN files. This feature requires testing. Note that a PGN must be set writeable before it can be modified.
This feature facilitates the exchange of chess games via PGN files, because different users may use different chess applications. But keep in mind that the PGN format is not fully supporting all the features of Scidb's format (nor the features of ChessBase format). If you export a database from .sci to .pgn, the PGN file in general will not have the same structure, the PGN format is limited concerning the handling of comments. If you want that an exported PGN is a 1:1 mapping of the .sci database (or ChessBase database), you have to use the PGN option "Use Scidb import format", but in general only Scidb is fully understanding the resulting PGN file, although any chess application should open this file without errors. Cheers, Gregor