Thanks for the help and response! You are awesome.

One thing though, I like the concept of preventing someone from opening a workbook if the workbook name has changed, but in my case, the files are created and named in a very complex way. For example, a file name is created for the file depending on the date and time that it is downloaded. So the file name could be something like WBBI_2006073116434. I don't want users to be able to rename the file, yet if they do rename the file manually, then they won't be able to access the workbook (which is good). However, they probably won't be able to remember the "old" filename, so they will never be able to access the file again. What can I do to solve this?

Any advice at all would be very helpful. Thanks again!!