A file extension, or file name extension, is the letters immediately shown after the last period in a file name. For example, the file extension.txt has an extension of .txt. This extension allows the ...

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.

Most email providers, including Gmail, don't allow you to send executable or ".exe" files. Executable files are programs that require the action of a user to install ...

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 ...

In the past, email servers accepted all file attachments, allowing viruses to be executed by unwary recipients who clicked on them. It was not uncommon to get messages such as "click this - coolest ...