Hi @sree813 ,
Based on my test, if it's a file with CSV UTF-8 format, the file content starts with "77u/":

otherwise, there isn't:

So, you can use a condition the check the content:

outputs('Get_file_content')?['body']['$content']
or
outputs('Get_file_content_using_path')?['body']['$content']
according to previous action you use in the flow.
Best regards,