We have windows 10 1709 with OneDrive files on demand enabled
One of my users have an issue where if he opens and closes a file the changes the date modified.
His computer is a relatively new installation and he is patched up to February's updates. OneDrive Client version is the latest. Most of his files are set to always keep, but when I added a new folder without always keep, created files and checked after a few minutes the issue persists.
I found several forums with the same problem and also several user voices for Microsoft talking about it.
This is because of AutoSave in the office clients. They continually save as your view them and they will make changes unfortunately sometimes by just looking at them. The only option you really have is to uncheck the option in your OneDrive client so the files don't open directly with office but open locally. It's sort of explained in this article, but this tick box should keep the files opening the old way and not using the auto save functionality.
Yes, Autosave on/off does not help this issue. I see this issue all over the support threads too. I am a recent convert from Dropbox, and this issue is seriously interfering with my workflow. File Open/Close has functioned one way in Microsoft Products for more than 3 decades. I am hoping this is a bug and not some new "feature."
I would like to amend my comment. It turns out that "Auto-Save" feature within Office Products is very different than the "Office Sync" settings within OneDrive. In the earlier post, user Chris Web referenced this article: