Agree Eric, that was my belief as well, first thing i did after I promised my customer that I have it fixed in no time :)

anyhow, it turns out that I had to add mimetype (application/vnd.ms-excel) to the extension .xls and .xlsx in the function:

located in CuteEditor_Files/Dialogs/Include_Mimetype.php

 

Now it runs smoooothly again.

 

Thanks!

 

/Bix