Export to tracks directory

How can I get an export script $filename to specify a file in the tracks directory that Mp3Tag tag panel shows labelled 'Directory:'?

I find no environment variable for this.

Thanks.

I am not totally sure, perhaps ... %_folderpath%'...'

DD.20140528.1925.CEST

Thanks D, but that does not work here.

Nor would I expect it to. %_folderpath% refers to the track, not the app state.

???
%_workingpath%
%_workingdir%

DD.20140628.2134.CEST

That's it. Thanks D. I'd missed that placeholder in the Help for Export.