Error message while opening .xls file

Hi,

I have created a macro to create a new workbook which saves in the same folder of the macro file.

But when I reopen the "New workbook" file I am getting the below message relating to the file extension, trusted source.

"The File you are trying to open, "New Workbook", 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?"

Please help to rectify the above message while opening the newly created workbook.

Regards,
Vijay