@milofields, did you make sure the excel file type matched the registry key you modified? When I was first trying it, I was attempting to open an .xls file but had only modified the Excel.Sheet.12...

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@milofields, As mentioned in the <solution> post, going to the specified location in the registry and replacing /dde with "%1" fixed the issue for me. So this really isn't an issue that I'm still...

@milofields I have used a multimonitor program in the past, it is called Display Fusion (link). However, I have not used it in at least a couple of years and have reformatted since I had last used...

Note: I've discovered an unfortunate side-effect of using this solution. It used to be that only one instance of Excel would run when multiple workbooks were open (unless a workbook was open and...

Thanks to the marked solution from the site below, I was able to get things working again.
Windows 7 - Cannot run multiple instances of excel using option

The site says to check the DDE option...

The full error reads: There was a problem sending the command to the program.
This is actually an older Excel problem that appears to have returned with my upgrading to Windows 10.
This error is...