OS: Windows 10 - 64-bit
To reproduce:
1. Enter the folder with at least 1 video file
2. Open this video file in associated program (e.g. VLC)
3. In MP go up and try to rename this folder
Actual behaviour (bug): Folder is not renamed, without error dialog

Expected behaviour: Error dialog that folder is in use should be displayed.
1. Enter the folder with non image file (e.g. video or chm)
2. Open this file in associated program (file must be in use)
3. In MP try to rename the file
Actual behaviour (bug?): MP "Replace" dialog is displayed instead of "file in use" error dialog

4. Click the "Rename" button (while the "New name" field contains the text "Copy of")
Actual behaviour (bug): File is not renamed, because it's in use. Without error dialog.
