How to make Word and Excel files can only be read and not modified

Operation Steps:

restricting changes in Word 2010

On the Review tab, in the protection group, click Restrict Editing.

The Restrict formatting and editing pane appears.

In formatting restrictions, edit restrictions, and start enforcement protection, you can choose from your formatting and editing requirements.

restricting changes in Excel 2010

On the Review tab, in the Change group, check the following protection options:

Protect sheet and Lock cell contents

Protect workbook structure and Windows for workbook protection

Protect and share workbooks prevent changes from being deleted

Allow users to edit ranges to determine which regions can be edited