Ensure File Open Dialogues include *.txt.txt in the "Plain Text Files" filter. 4. User Experience
if filename.endswith(".txt.txt"): safe_filename = filename.replace(".txt.txt", ".txt") # Log incident for user warn_user("Double extension detected. Renaming for safety.") Use code with caution. Copied to clipboard .txt.txt
The purpose of this feature is to identify, validate, and correctly process files named with the suffix .txt.txt (e.g., report.txt.txt ). It ensures that applications treating these as plain text still parse them correctly, while security systems recognize them as potentially deceptive. 2. Functional Requirements Ensure File Open Dialogues include *
The system MUST identify files ending in .txt.txt as plain text files, similar to .txt files. Renaming for safety
The "Save As" dialogue MUST prompt the user to normalize the file to a single .txt extension.
The system MUST flag .txt.txt files in email attachments or download folders for potential spoofing. 3. Implementation Logic Detection: Scan for file extension regex: ^.*\.txt\.txt$ Handling Rule:
Default text editors (e.g., Notepad, TextEdit) SHOULD open .txt.txt files directly.