Hey, I've been using Defraggler for quite a long time without any trouble. However, I am experiencing a possible issue that I cannot resolve on my own. I'll try to keep it short and to the point. Software Windows 10 Pro x64 (licensed) Piriform Defraggler v2.21.993 (64-bit) Hard Drives and Partitions C:\ Samsung 850 PRO SSD D:\ Seagate 3TB 7200RPM HDD E:\ Seagate 3TB 7200RPM HDD The main issue is that I am unable to defrag the following files which are exclusively used by the Microsoft Windows Store. These files belong to the videogame Gears of War 4 which is only available through the Windows Store on Windows 10. This is the result after a full defrag of my D:\ drive. Any further defragmentation seems impossible. When I select these files and select Defrag Checked I get the following error: The only thing that I get from this is that this issue is limited to the Windows Store files and that they are quite large. These files however, are not located on my C:\ Windows partition. As far as I know, this means that Boot Time Defrag won't do any good. Any possibile solutions?