I encountered an annoying question today.

admin

A colleague's computer is Win10, which he just switched to last week. He had Win7 before. Today something went wrong in the desktop. Right-click and created a new blank Excel. Then used Excel to edit content for a long time. After saving it out of Excel, I tried Ctrl+Z on the right-click menu. The file disappeared. Clicked the right-click menu again and found there was a Restore option. Clicked it, then the desktop returned with an empty file. But its contents were still all white.