Hi,
Thanks for choosing Microsoft.
Based on your description, there is no option to export an iqy file to Excel from SharePoint Online on Mac.
If so, if you want to use open a .iqy file in Excel for Mac, please go to the Data menu and choose Get External Data > Run Web Query to check the result.
If this is not what you mean, please point out.
To better understand your scenario, we would like to confirm some information:
1.The screenshot about your scenario(no option to choose 'excel' as the application to open with which is greyed out).
2.Does the issue happen on all files or a specific one?
- What’s your Excel version? Please go to Excel> click “About Excel” and capture the screenshot of it.
Best regards,
Gloria