blocking Winzip from opening a specific file type

Dear team,

it could be a good idea to have the possibility to block winzip to open some specific file extensions.

For one of our project, we give the users some VMDK files that they are not suppose to look inside, for security reasons.

They are currently capable to open that files.

We'd like to have a sort of switch, in the registry, that will prevent winzip to open that files.

thx

alex