The files you are referencing are not specific to VoiceAttack, but would likely be used by VoiceAttack, as they would be used by any application using the SAPI speech recognition engine.
The tools used to train the SAPI speech recognition engine are not part of VoiceAttack itself. VoiceAttack provides shortcuts to the tools from Microsoft, as a convenience feature.
Adding a word to the dictionary is intended for words that either aren't in Microsoft's default dictionary, or that you pronounce differently.
It is not a substitute for training your actual speech recognition profile (which should be done at least three times, as mentioned, but can be repeated afterward).
Also note that the speech recognition engines are intended for a specific language and
accent. E.G. if you don't speak English with a US accent, the US English speech recognition engine cannot perform optimally.
If a speech recognition engine is available in your native language, that may offer better results (if no SAPI engine is available in your native language, it may be available through Speech Platform 11. More information on that
here).
There are a number of keyboard layouts available that will affect the keypresses sent by certain actions; make sure to select the keyboard layout you are using for the "Keyboard Display Layout" option on the "General" tab of the VoiceAttack options window, provided it is listed there.
This does not affect speech recognition.