>>Then you must create a UUID and name the file like that. This is fool prove. (But, given the extra time to create the UUID a FOR NEXT loop might be finished in this time too) ;)
>
>I think I will stick with scanning the array and deleting the "bad" columns. One approach vs the other could be a few millisecond difference. The customer will have to wait :)

Only that I would try to delete the lines out of the array. Result might be odd, if the columns are deleted ;)
Have nice day.