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Therefore, all you need is to modify the file format and it will become available. But Excel since 2007 saves files in the XLSX format.Ī mismatch between file extension and Excel version may cause the error “Excel cannot open the file because the file format or file extension is not valid”. In all versions of Excel until 2007, documents were saved in the XLS format. If you still get an error message that Excel cannot open the file because the file format or file extension is not valid, there are some great methods to fix it! Method 1.Change the file extension! The document was edited several times in different versions of Excel.The document is damaged or incompatible with the current version of Excel.This may occur for the following reasons: You can then apply the colored style when editing and the non-colored style when preparing to print.While working with Excel, you may see the message: Excel cannot open the file because the file format or file extension is not valid. Define a style that has the desired background color, and another that does not. You could also define styles for use in your worksheet. This allows you to turn the background color on or off (for printing) by changing the value of a single cell. If the cell is not True, then the color is not applied. The format can look at the cell you defined, and if it is True, then the color is applied. Then select your worksheet that you want to have the background color and use a conditional format to define that color. In a blank area of your workbook, define a cell that contains the value True. Speaking of conditional formatting, if you aren't using conditional formatting for any purpose in a worksheet, you could use it to create your background. The benefit to this approach is that it doesn't affect any conditional formatting and the background image won't print.
![how to restore gridlines in excel 2003 how to restore gridlines in excel 2003](https://www.repairmsexcel.com/blog/wp-content/uploads/2021/10/Turn-Gridlines-On-Off-For-Entire-Worksheet-1.png)
The graphic image is placed in the background and repeated over and over again so that it fills the entire background.
![how to restore gridlines in excel 2003 how to restore gridlines in excel 2003](https://i.ytimg.com/vi/8Ms2pg32e4Q/maxresdefault.jpg)
There are a few things you can try as workarounds, however. Unfortunately, there is no way to change the background color it is not a configurable option in Excel. You may, at some time, want to change the background color to something else, such as a light grey. The standard background color in Excel is white.