Hi everyone. I recently discovered that updating to 8.1 caused all my local files that were also monitored by Skydrive to become corrupted. After getting Skydrive to make all my files "available offline" again I noticed that the original files are still corrupted and that the software has added "-n" to either a single or multiple duplicates. So a file called name.jpg now has name-1.jpg and possibly name-2.jpg alongside it. The name.jpg is still corrupted, but name-1.jpg and name-2.jpg are fine. I want to delete every file before the update that doesn't end with "-1". The search is: Files that aren't folders last modified before 22/09/13 that don't end with "-1.*" Is this possible? I've been struggling with Explorer for about an hour and kept (temporarily) deleting lots of files I wanted to keep.