The inability to delete a PDF file was also a problem in Windows 8 and continues in Windows 10. The problem is associated with use of the Preview Pane in Windows Explorer. There are 2 workarounds: In Windows Explorer, turn off the Preview Pane. (Alt+P, or click"Preview Pane" in the Windows Explorer tool bar.) If that doesn't work, use SHIFT+DELETE to permanently delete the file. (Caution: You won't be able to un-delete). This bug only affects PDF files. Other file formats delete without issues in Windows Explorer.
... View more