Lingua export locale file to application

Hello, I try to update an application (Filmotech) with locales issued from Lingua.
I get le locale file and edited it with Lingua plugin but when I try to export my changes to the application I have a message
“Sorry could not update application” ! on windows 7 computer.
The application Filmotech is installed directly on C:/Filmotech where I’m supposed to have full rights.
Any idea of what can cause such message ?
Thanks for your help