Files with the .XLSX extension contain spreadsheets compressed in ZIP format, stored in an open format based on XML – Office Open XML. It was introduced into Microsoft Office suite since its 2007 version, in order to provide higher format portability.
File with .XLS extension contains spreadsheet document created with Microsoft Excel. XLS is a binary file that uses either MS-XLS BIFF8 or BIFF5 standard. Binary XLS file format was used by Microsoft Excel versions 97 to 2003 and older Excel 5.0/95.
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After converting the file to the new format, you will be able to use other programs to support it. Keep in mind, however, that the XLSX file after converting to XLS may differ slightly from the original. The most important information should be kept, but if you want the file after conversion from XLSX to XLS to be the same, you have to do this carefully and choose the proper application from the list below.
There is no guarantee, of course, that the conversion will come up to all your expectations, but it will certainly help you. If, after all, the effect of converting XLSX to XLS does not meet your expectations, you can simply try to find on the Internet a different version of your file in XLSX format, properly converted to a XLS file by someone else. If this fails, use the information provided in the further part of the website.
If after converting the file XLSX the desired result was not achieved, you can try to change the format of XLSX file to other than XLS. On our website you will find more information on the following conversion options
File Conversions from XLSX extension to a different format
Unfortunately, if after performing the two previously described steps (trying to find your XLSX file converted by someone else, and the attempt to convert it to XLS on your own) you still have a problem with your file, then there are only a few solutions left. You can once again try to find and install an application that can open the XLSX file in its original format (without conversion to XLS file). Such a solution will be difficult to implement, but it certainly will give the best result.
