Error message when trying to use the “View in Excel” view from the Quest List view:-
“The file you are trying to open, ‘<file name>’, is in a different format than specified by the file extension. Verify that the file is not corrupted and is from a trusted source before opening the file. Do you want to open the file now?”
Selection choices “YES” and “NO”
Clicking on “Yes” still opens the file.
Title
Warning message when using “View in Excel” in Development Studio for SharePointDescription
Resolution
There is no solution for this issue. The only workaround is to ignore the warning message.