Cannot uncheck windows "File name Extensions"

after the update Bit Defender had yesterday, cannot uncheck "file Name Extensions". now all my files showing file extensions and this is annoying coz i work with MS Office more often. plz can anyone provide a suggestion to solve this ?

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Rich Text Editor. To edit a paragraph's style, hit tab to get to the paragraph menu. From there you will be able to pick one style. Nothing defaults to paragraph. An inline formatting menu will show up when you select text. Hit tab to get into that menu. Some elements, such as rich link embeds, images, loading indicators, and error messages may get inserted into the editor. You may navigate to these using the arrow keys inside of the editor and delete them with the delete or backspace key.