While there are several approaches to managing "in-use" errors in OS X, you can often make use of the Trash to temporarily store these files so as not to disturb your workflow. Topher Kessler MacFixIt ...
When you can't open, edit, or delete a file in Windows File Explorer, it's either still open in a program running in the background or something didn't close properly. Luckily, you can force delete, ...