If I go to any PDF file, then right-click Open with, Microsoft Edge is always there no matter what reg I delete. I Checked here: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.pdf Its not there. Checked several locations listed from google. Remove all pointing to Microsoft Edge. Yet its still there. Then went to regedit Computer find .pdf . No mention of Microsoft Edge anywhere. Unsure if NirSoft has any software to dig out open with Microsoft Edge.