xlsb – these can be secure, but more on this below. The password to open the file if it's an.In my view there are two types of password in Excel:
This is a very sensible approach to protecting what is often commercially sensitive information, but is it really secure? Unfortunately, in almost all models we see, the password is so easy to crack that it really only deters the most casual user.
At JPA Financial Modelling we see lots of confidential models which are password protected.
