Thanks to everyone who has mentioned how much they like the File Version Check tool. I’ve added the ability to generate a report on an entire folder & all of its subfolders. The output is also now written to an Excel file instead of a CSV file.
Download it at http://gdurl.com/lbnw/download
With this I was able to run a report on the 13,375 Revit files in C:\ProgramData\Autodesk and generate the report excerpted below.