New installations of Windows hide all file extensions, except for Windows components, that would appear in Explorer or an application dialog box that displays file names. File extensions are ...

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.

Computer viruses sometimes masquerade as harmless e-mail attachments. The fastest way to spot the interlopers is by their file extension–the letters (usually three) following the final period in the ...

Windows Explorer has displayed file metadata for a very long time. Click an image, say, and you’ll see (and have the option to edit) details like the picture title, author, comments, camera ...

Is anyone else annoyed by how Windows XP offers to save file extensions like JPEG, GIF, PNG, and TIFF in programs like paint? The extensions are all in CAPS. So, is there a registry hack that allows ...

File name extensions are how OS X recognizes file types, and changing the extension is one way to associate a file with a different program. Sometimes, however, changing the file extension does not ...

In the Mac OS it is possible to change the default program the operating system will use to open a file when you double-click on it. After you have changed this file association, though, you may want ...