“Right click anywhere in Windows Explorer and press Undo Copy. You can’t miss it, it’s right above the "New" option:”
Undo Copy in Explorer deletes the copied file even after hours of edits, with no Recycle Bin entry and no warning. Redo Copy brings back the original template, not your work. The fix is a registry key that sets MaxUndoItems to 0. Microsoft put a delete button one misclick away from New Folder and never checked whether the file had changed.