Indeed. Windows is notorious for silently writing data to disks without asking for permission. Prior to Windows 10, just reading a file resulted in the 'last accessed' timestamp being updated! It's hard to believe that someone senior at Microsoft signed-off on that decision when you consider that flash memory has a limited number of write cycles.
Another example, which has burned me a few times, is their damned photo viewer. If you magnify the image then nothing happens, as you'd expect. However, if you rotate the image, Windows will overwrite the original image with the rotated version completely silently! And to rub salt in the wound, the image conversion is carried out in a lossy way!