You could either protect it on system level, like on the Mac with File Info > Protect, a protected version will be opened or on the Mac you could also tick the template option to any indd file.
Sorry Willi, I don't follow you - we're on Windows 7, not OS X.
And what's the 'template option' going to do?
You cannot change the behavior for naming when saving from templates.
There is no structural difference between a .indt file and a .indd. the different extension simply triggers a default opening method: .indd opens as original and for safety (so you don't accidentally overwrite them with content) .indt files open by default as untitled copies. IF and it's a big IF, your people can be counted on to never hit Save (only Save AS), and always to navigate to new folders to save the documents, then saving the templates as .indd (and you can just change the extension on existing ones) would preserve the names. Marking these "templates" as read-only should add a layer of safety.
You can lock also on WIndows any file, this might be your solution.
Template on the mac opens a file with the very same name but it cannot overwrite the original file, pretty the same as indt, but with indd ending, and this method could be used with any kind of file.
There is at least one huge difference between indt and indd. You can put an indd in a book file and so synchronize it, you can't do it with an indt. I put often documents n a book file not because I need a book, but I need to synchronize them in several kind of ways.
I thought that the Soxy plugin (by Rorohiko) has an option to do just
what you're asking, but unfortunately no, it works with IDML files...
However, this could easily be scripted...
Thanks Peter, read-only .indd 'templates' looks like a good solution.
Just so I get it straight - .indt files offer no greater functionality than .indd, apart from opening and saving behaviour?
Other than Willi's comment about not being able to put .indt into a Book, no, and that's arguably less functionality. You can manually change the extension between .indd and .indt and get the changed default opening behavior, so there is no structural difference in the file.