The extension xls is a spreadsheet and xlt is a template. A template is a pre-designed layout for an Excel spreadsheet.
You can do it through the options when saving the file.
When referring to Excel 2007, there are two file types you can use when you save a file, XML and binary. If you save the file as binary, then there is no difference between the two. If you save the file as XML, then the XML file contains XML formatting data (explanation beyond the scope of this question) and the binary file is formatted for computers to read directly.
That will depend on what you want to do. If you are in Excel saving as a standard Excel file, you don't need to change the file type. It is only if you want to save into a different format, that you would change the File Type. What you change it to, would depend on what you need. You might want to change to a different version of Excel or maybe into a completely different format, such as a text file. If you are working in a different application, saving something to be used in Excel, then again it will depend on what format you actually need.
The xlsx file extensions are from Excel 2007 whereas xls is used in the earlier versions of Excel.Thanks
Microsoft Excel offers more than 30 file formats for saving a workbook. Iif you go to Save As and bring up the list in the "Save as Type" field, it will show you all the available options for your version of Excel.
the amount of the file saved
When saving an image as a TIF file, it retains high quality and is best for printing or editing. Saving as a JPG file compresses the image, making it smaller and suitable for web use, but may lose some quality.
When saving an image as a TIFF file, it retains high quality and is suitable for professional use, but the file size is larger. Saving as a JPEG file compresses the image, making it smaller in size but may lose some quality.
When you run a file it goes to a temporary location and can be deleted, but when you save it will be saved to your computer and it cant be deleted unless you do so.
If you close a file in Excel and answer no when asked to save it, it means that the file will not be saved. If it is a new file, then it will all be lost. If it is an existing file, then any changes made since it was opened will not be saved, so the file will be as it was when it was last opened.
When saving an image as a jpg 100, it will have higher quality and larger file size compared to saving it as jpg 20, which will result in lower quality and smaller file size.
Passwords can be set and changed from the Tools and then Options menu when saving a file.