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.

One of our readers reported that all the file extensions have changed to some unknown file format. If so, it could be a virus! If a virus has changed all the files extensions to unknown applications, ...

A file extension is a suffix that is added to the end of a file name after a dot. It is usually two to four letters long. File extensions help Windows and other operating systems to know the standard ...

File Explorer in Windows 11 has some problems, but many of them can be easily fixed with just a few tweaks.

First, open Windows Settings by pressing Windows+1 on the keyboard. You can also rick-click the Start button and choose Settings from the menu. In Settings, select "Apps" in the sidebar and choose ...

The type of file format that the current data will be saved to if no other file type is selected. For example, in a graphics program, the default file might be a JPEG or GIF. In Microsoft Word, the ...

Microsoft uses file associations to set default programs for opening different file types on all its operating systems. As a result, when you open a file, be it text, image, or document, on your ...

What steps do I need to take to change the default action on Windows XP and Windows 7 when someone tries to open a CHM file? I want the file extension to be associated with notepad.exe for ALL users.

Back in the pre-Mac OS X and macOS days, Apple’s System 9 and earlier relied on hidden metadata to associate files with apps. File extensions, those bits of text that follow a period at the end of a ...