Microsoft hides file extensions in Windows by default even though it's a security risk that is commonly abused by phishing emails and malware distributors to trick people into opening malicious files.

Need to look at invisible files and show hidden file extensions in Windows? Here's how to reveal them.

View file extensions in File Explorer Never be confused about file types I deal with many different file types on a daily basis, whether they are JPEGs, PNGs, PDFs, or Photoshop files.