Win10x64, Office 2010x86, Excel won't open files (DDE is to blame)?

Question

excel

The problem initially was that all *.xlsx files opened in one window.
Google gave information, but the problem remained ...
What was done.
The association of the xlsx file format to the action "open" with
"C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde has been fixed
to
"C:\Program Files (x86)\Microsoft Office\Office14\EXCEL .EXE" /n "%1"
It didn't help, with this fix, just an Excel window opens, without a file ...
Although, interestingly, docx files open in different Word windows, with the docx format association
"C: \Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE" /n "%1"
and there are no problems)
What to do? =)

Answer 1

res2001 nothing has changed... It's
amazing... how many options I tried, none of them helped, that where only it was not written what to do...
A simple instruction from the small-soft site helped, look:
https://support.microsoft.com/ru -en/help/2636670/h...

Answer 2

Reinstall?