Profiles are not stored in .vap files unless you export them explicitly; VoiceAttack stores them in a database file.
The database files can be found in "%localappdata%\VoiceAttack.com"; VoiceAttack.dat is the current database, the "Backup" folder contains, as you'd expect, earlier versions.
There is a link to that folder on the "System / Advanced" tab of the VoiceAttack options window, labeled "Click here to browse VoiceAttack's data folder.".