Sub to lock vbaproject for viewing for all xls in folder using a common password

[Max]

I've got 30+ .xls files in a folder (eg: E:\Max\Excel) that I would like to
protect, ie Lock vbaproject for viewing using a common password, eg:
vbapaswrd. Is there a sub which can do this? Thanks.

 

[Max]

From the lack of responses, guess there's no way other than to do it
manually, file by file (sigh)