The short answer, and I a sorry to say, is no. You can not protect the 75 files without opening them.
Protect is an iternal process within Word. therefore it most have an instance running to execute the protection.
As for comments regarding Ane's code:
1 I have to point out that what it does (and notice that it DOES, in fact open the files) it a file protection via a password, on the file itself.
2. the password "strPassword" is neither declared, nor defined. The password that would be set for each file would be NULL, not "" - or blank. This is significant difference. In other words, the variable strPasword is not even defined as a String, so it would default to a type Variant, which, as it is used, would put the value as "Null". This is not a good idea.
3. If you have formfields that need protection so they can function, this code will not do that.
Please post if what you need is a file protection (ie. a password required to open the file; or protection inorder to make forms within the document function.
Gerry