A long time ago I wrote this little tool called FileTouch in Delphi for Windows 95. It allowed me to change file timestamps and other attributes for single files or entire folders. At that time it was pretty popular to reflect a software version in the files’ timestamps as well.
It seems like this little tool still works today. The screenshot you can see here was taken on Windows 10. Please note that I no longer support this tool in this version. I still provide the download link because there are a few references to it.