Hi
Perhaps something like this.
It finds comparable file names in 2 folders then identifies if the file lengths are different.
It lists the names of those files that are different but not where they are different.
Your post suggests you might already have that code and indicated is where the proc or function should be called from.
To demonstrate the code I have used a file compare function authored by Ervin Kosch - see comments above his code.
Install the sub and function in a standard module and change the directory names where indicated.
hth
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