The XLT file type is a template for Microsoft Excel and is used for preserving a certain template within Excel . This type of file can also be opened by OpenOffice. Warning: the XLT extension is often used for sending infected files. Do not open these sorts of files that are from people you don’t know.
MIME TPE: application/vnd.ms-excel [official] application/excel, application/msexcel, application/x-excel, application/xlt, application/x-msexcel