How do you solve Excel Cannot open the file because the file format or file extension is not valid?

You can restore the Excel file format, or the file extension is not valid from previous versions. Select the damaged file. Right-click it and click “Properties” > “Previous Version”. A list of previous versions will appear; you need to select the option you are interested in and click “Restore” to recover.

When I try to open an Excel file it says there was a problem sending the command to the program?

To correct this setting, follow these steps: Select File > Options. Select Advanced, scroll down to the General section, and then clear the Ignore other applications that use Dynamic Data Exchange (DDE) check box in the General area.

Can I open an Excel file if I don’t have Excel?

Summary. The Microsoft Excel Viewer is a small, freely redistributable program that lets you view and print Microsoft Excel spreadsheets if you don’t have Excel installed. The Excel Viewer can open the latest version of Excel workbooks. However, it will not display newer features.

How do I open an existing Excel workbook in C#?

For open or read an Excel file in C# , first you have to add the Microsoft Excel 12.0 Object Library in you project. Create a new project and add a Command Button to the Form. Form the following images you can find how to add Excel reference library in your project. Select Reference Dialogue from Project menu.

How do I open an unsupported Excel file?

While there are file converters out there, the most common way to get an unsupported file format into Excel is:

1. Open the unsupported data file with the software used to create it.
2. Use the Save As or Export functions to save the file in either Comma-Separated Values (CSV) or XLS(If Supported) file format.

How do I fix the command in Excel?

Excel FIXED Function

1. Summary. The Excel FIXED function converts a number to text with fixed number of decimals, rounding as needed with the given number of decimals.
2. Format number as text with fixed decimals.
3. Number formatted as text.
4. =FIXED (number, [decimals], [no_commas])
5. number – The number to round and format.

How do I disable DDE?

Microsoft Excel Excel depends on the DDE feature to launch documents. To disable the DDE feature via the user interface: Set File->Options->Trust Center->Trust Center Settings… ->External Content->Security settings for Workbook Links = Disable automatic update of Workbook Links.

How do I open an Excel spreadsheet?

To open an Excel file:

1. Click on the Open button on the toolbar, or select File > Open….
2. Browse to the Excel file of interest and click Open.
3. Select the Worksheet to import.
4. Look at the Data preview and make sure that the format of your data looks OK.

How do I open an Excel spreadsheet on my laptop?

To open Excel from Windows start menu, click the Windows icon on left bottom corner of Windows taskbar or press the Windows key on your keyboard. Scroll down to letter “E” to find Excel shortcut in start menu. Click the Excel menu item to open Excel.

How do I open a worksheet in C#?

Step 1: Create an instance of Excel workbook and load the document from file.

1. Workbook workbook = new Workbook(); workbook. LoadFromFile(“Sample. xlsx”);
2. Worksheet sheet = workbook. Worksheets[1]; Step 3: Activate the sheet.
3. sheet. Activate();
4. workbook.SaveToFile(“result.xlsx”,FileFormat.Version2013); Full codes:

How read data from Excel to Datatable in C#?

Step 1: Create a oledb connection,command and adapter fields. Step 2: Create method like to initialize oledb connection string. Step 3: Create a method like below to read records from excel file I name it as ReadFile(). Step 4: Now we reached the file step to invoke all the methods we created.