Hi I cannot open multiple excel(2010) instances at the same time. After enabling "Ignore other application that use Dyanamic Data Exchange (DDE)", I can open multiple instance. However, days ago, I suddently could not open all excel files. After disable "Ignore other application that use Dyanamic Data Exchange (DDE)", I can open excel file, but i cannot open multiple excel files at the same time. Anyone can give some idea for this? Thanks
"Ignore other application that use Dyanamic Data Exchange (DDE)" is located at Option ----> Advanced ----> General
You should always be able to start Excel manually in multiple instances.
It should always work to open sheets if done in Excel itself.
So I guess your issue is only with clicking on files in Explorer?