Hi there, @Cyborg.

Thanks for letting me know what troubleshooting step you've tried to export the report. Let's get this working to get you back on track.

First, let's check if the Excel you have is compatible with the version of QuickBooks you're using. I recommend checking the following article to see the software compatibility: QuickBooks Desktop system requirements.

Technically, restarting the computer can resolve unexpected behavior with exporting the report to Excel. Since you get the same result, can you confirm if you already tried the steps provided by DebraP? When the Excel cannot open the data file exported, closing the excel.exe can do the tricks. 

If you're still receiving the issue, let's make sure you have an active and up-to-date version of QuickBooks. Then, try to repair QuickBooks and run a Detect and Repair for Microsoft Office to fix possible damaged files. 

After that, restart your computer, then open QuickBooks. Please try to export the report again. 
 

Give this a try and let me know how it goes. I want to make sure everything is working on your end.  If you need further assistance working with QuickBooks, please leave a comment below. I'm always here to help. Wishing you the best!