Use Excel 2007 (from Office 2007) or higher.
If you don't have excel you can use the XLSX viewer tool. The tool allows to view the content of Excel files. It opens XLS, XLSX and other Excel formats even if Excel is not installed at the system and also recovers corrupted files and has a built-in browser allowing you conveniently navigate through your file. See the link below.
Excel 2007 creates xlsx files, and earlier versions of Excel create xls files. The earlier versions won't be able to open the 2007 files. So you need Excel 2007 to open them or get a converter or try and open them in Google docs. If you get them open, then save them in your version of Excel so that they can be opened in future, using the Save As option on the File menu.
The files ending in .DOC are the designation for Word 2003 (and earlier). Files ending in .DOCX are the newer version files. The .DOCX files are a different format of file altogether. The .DOCX file is actually a ZIPped archive, with files inside of it based on XML language. If you want, you can rename a .DOCX (or .XLSX) file to have a .ZIP extension, then double click it and it will open up the ZIP archive and show the other files.
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No. A docx file is a Word document and a xlsx file is an Excel document. It is possible to copy data from one to the other, like copying a table from Word into Excel, but the files as a whole cannot be understood by the other application.
A file that has .xls, .xlsx, .xlsm as file extension then it is known as excel file.
No, MS excel opens xls/xlsx files (spreadsheets). To open a pdf file you need software like Adobe Reader.
Excel 2013 uses a .xlsx extension.
An Excel Book or Excel Workbook with the files extension of .xlsx
Excel files are usually .xls In Office 2007 Excel files that are single pages are still .xls while workbooks (more than one page) are .xlsx There are other extension for documents that are web pages in Excel, documents that have macros enabled and other such things. To find out, go to your Excel program and click "save as" When the menu comes up, click on the pull down menu "save as type" You will be able to see all the different options there.
.xls or .xlsx for Excel spreadsheets. .dbf for dBase databases. .bat for Batch files. .bmp for Bitmap files. There are a huge amount of others.
Worksheets do not have extensions. They are contained in files known as workbooks. A 2007 workbook extension is .xlsx.
..xlsx is a Excel 2007 format, whereas .xls is Excel 2003 or earlier. Excel 2007 allows you to save in multiple 2007 formats: ..xlsx - Normal Excel 2007 format ..xlsm - Macro-Enabled format ..xlsb - Binary format Save your files as 2003 under Save as Type and you should be fine.