Thank you!

I did a bit of testing and there are several issues that need to be fixed:

• I am not sure you need to voice the "Delphine Software Cinematique" at the start, but if you want to do it you should switch the TTS to English. Because otherwise, at least in French, it sounds weird.
• The timing for the text on the protection screen is strange. Initially it only says "Protection". Then you need to go on the OK button to get the first block of text. Then move away from the OK button and back on it to get the rest of the text. And move away and back to get "OK", which you get three times! See video

• The encoding is not correct. For example with the French version the text on the protection screen should be

Placez la flèche de la roue sur le chiffre qui vous sera indiqué.
Sélectionnez les objets appartenant à la case dont la lettre vous sera indiquée.
Il vous faudra répondre correctement aux deux tests demandés par l'ordinateur.
Exemple: Si l'ordinateur demande A1, sélectionnez les figures...

And instead what is spoken is

Placez la flÞche de la roue sur le chiffre qui vous sera indiquÚ.
SÚlectionnez les objets appartenant Ó la case dont la lettre vous sera indiquÚe.
Il vous faudra rÚpondre correctement aux deux tests demandÚs par l'ordinateur.
Exemple: Si l'ordinateur demande A1, sÚlectionnez les figures...

So:

• é -> Ú
• è -> Þ
• à -> Ó
  Other accentuated characters are probably incorrect as well but I would need to play more to get them.

é -> Ú
è -> Þ
à -> Ó
Based on those it looks like the game is using ISO 8859-1 (latin1) encoding.

CP 850 (currently assumed):

ISO 8859-1