There are a few different ways to protect your Excel files from Word. One way is to save your Excel file as a PDF. This will prevent Word from opening the file and making changes. Another way is to password protect your Excel file. This will prevent anyone from opening the file unless they have the password. You can also encrypt your Excel file. This will make it so that only people with the encryption key can open the file. Finally, you can hide your Excel file by making it a hidden file. This will prevent Word from finding the file and opening it.
To save your Excel file as a PDF, open the file in Excel and click on File > Save As. In the Save As dialog box, select PDF from the drop-down menu next to Save as type. Click Save and enter a password if you want to password protect your PDF. To encrypt your PDF, click on File > Properties and select Security tab. Under Security method, select Standard encryption and enter a password. Click OK to save your changes.
To password protect your Excel file, open the file in Excel and click on File > Save As. In the Save As dialog box, select Password Protected Workbook from the drop-down menu next to Save as type. Enter a password and click Save.
To hide your Excel file, open Windows Explorer and navigate to the folder where your Excel file is saved. Right-click on the file and select Properties from the context menu. In the Properties dialog box, select Hidden under Attributes section and click OK.