在CentOS上设置LibreOffice为默认应用，可通过以下两种方法实现：
/etc/xdg/mimeapps.list文件，在[Default Applications]部分添加以下内容：application/x-msword=libreoffice-writer.desktop
application/vnd.openxmlformats-officedocument.wordprocessingml.document=libreoffice-writer.desktop
application/x-excel=libreoffice-calc.desktop
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet=libreoffice-calc.desktop
application/x-powerpoint=libreoffice-impress.desktop
application/vnd.openxmlformats-officedocument.presentationml.presentation=libreoffice-impress.desktop
