Fix an issue that opens multiple Excel.exe processes by double-clicking an Excel file

Fix an issue that opens multiple Excel.exe processes by double-clicking an Excel file
Sometimes, double-click two Excel files, will open more than one Excel process, different processes can not copy paste formula, can only paste values, very inconvenient.
How do I double-click multiple Excel files to open only one Excel process?
1. Use the shortcut key combination "Win+r" to bring up the Run command box, type Regedit.exe, enter, and open Registry Editor.
2. Modify the Hkey_classes_root\excel.sheet.12\shell\open\command value.
Expand "Open\command" on the right-hand detail window:
Double-click to open Default and change its key value to "C:\Program Files\Microsoft Office\office14\excel. EXE "/dde
(If you're using Office 2007, change Office 14 to office 12.) In addition, do not lose the quotation marks)
Then, double-click Command, move the mouse cursor to the value data Finally, change the last parameter,/E or "%1" to/dde
3. Use the same method to back up and modify the Hkey_classes_root\excel.sheet.8\shell\open\command.
4. Export Hkey_classes_root\excel.sheet.12\shell\open\command to File Excel.sheet.12.reg
5. Export Hkey_classes_root\excel.sheet.8\shell\open\command to file Excel.sheet.8.reg.
After you double-click the two files to import the registry after you have restored the system, you can ensure that you double-click multiple Excel files to open only one Excel process.

Troubleshoot opening multiple Excel.exe processes by double-clicking an Excel file