要在电子表格应用程序中打开CSV文件的mimetype设置

My application lets users download their data as CSV files. These are supposed to open in spreadsheet applications. On a Linux system, I get prompted correctly to open with OpenOffice, but some of my users complain that when they download the file, it does not open automatically Excel, but asks them to choose the application. When they download a CSV from some other site, it opens correctly in Excel.My application lets users download their data a