Hi, I admit it, I'm not a mac user and never have been...sorry. However, I have a customer who is and wants to uplaod excel files to my website from their mac. At the moment we have validation on the site to only permit files with a .xls or .csv extenstion to be uploaded - which I intend to sort out. But in the meantime is there a way my customer can rename the file on their mac to have a .xls extension, therefore allowing it to be uploaded to my site? (I know the data is cross platform). Any help much appreciated!