Do not allow save if multiple versions of same file is open in same computer
Lets say, you have 10 files open when you are working in illustrator. You take a break and come back, and open another instance of the same file say, X (you forgot you have X already open). It does give you a message, that 'the file is already open, do you want to reopen' etc., but you are quick these days to click ok on any dialog box, rather than reading what the message was. Now, you have two instances of the same file open in the same window. This leads to multiple complications:
1. You save one version. Take a break, come back and find another version. You see it does not have the latest changes, leading to confusion and overwork.
2. You save the latest file to close it. Then as you are closing the files, you reach the earlier file, which is an earlier version. Now to close you have to save, and the moment you save, you have overwritten the latest file with a previous version.
To avoid this, if multiple version of the same file are open on the same computer, please give an error message -
' A file by the same name is already open - last revised at DD/MM HH:MM. Saving this file will overwrite this file.'
Or 'Switch to the other file to close that file'.
This is a menace that can be avoided. I would suggest the same file not be open in the same computer with multiple versions.
...and you are 'quick these days to click ok on any dialog box', including this warning message :)
The idea is fine though, I remember having duplicates opened too