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List of common email attachment blocked file extensions
Check out list of files that are typically blocked as attachments in e-mail clients to protect the end recipient.
Common file extensions blocked by mail clients may change in time as the popularity and significance of some formats can change.
Whole category of file extensions blocked by mail clients contains now 95 file types. Show all email attachment blocked file types.
 app | Files with app extension are commonly related to app packages for Mac OS X (macOS) operating system for Apple Mac Pro, MacBook Pro, Mac Mini and MacBook Air computers. |
 asp | An asp file extension is associated with the ASP Classic server side scripting engine used to dynamically generate web pages. An asp file contains Microsoft Active Server Page source code scripts. The ASP Classic is obsolete and it was replaced by ASP.NET. |
 bat | Files with bat file extension can be commonly found as so called batch files. These text files are small scripts that contain a sequence of commands for a computer operating system. |
 chm | Files with chm extension are mainly related to Microsoft compiled HTML help file format. CHM is acronym for Compiled Help Modules. |
 cnt | A cnt file extension is related to the Help Contents files used by Microsoft Windows Help. |
 com | Files with com extension can be generally found as command files. It is a type of program executable file format associated with the MS-DOS operating system. |
 eml | An eml file extension is used by various e-mail clients, such as Microsoft Outlook, Windows' default mail client, Thunderbird, etc. An eml file contains saved email messages either meant as backup or for sharing. |
 exe | Files with exe extension are best known as main program executable files since the times of MS-DOS. It was adopted for executables in Windows as well. Executables are files that launch programs. |
A gadget file extension is used for Windows Gadgets, small programs that enhance the desktop with various features. Gadgets are usually located in the Windows Sidebar, on the right side of desktop. | |
 inf | Files with inf file extension can be generally found as various installation scripts in Microsoft Windows operating system. |
 js | Files with js extension can b commonly found as JavaScripts. Used to execute scripts on internet pages and such. |
| lnk | File extension lnk is used for files that represent Windows shortcut to a program installed on computer. Every time you create a shortcut, a new lnk file acts as the actual link, which can be further customized with various settings such as launch parameters, icons, etc. Most lnk files are located on the user's Windows desktop. |
Files with mdb extension can be found as databases from Microsoft Access database management system. Used in older version, but still supported in modern Access. | |
Files with msi extension are commonly used for Microsoft Installation packages used by most Windows based programs. If you open msi file in Windows, the installation procedure will commence. | |
| prg | A prg file extension is default file extension used by operating systems and development environments for program executable files. |
 reg | Files with reg extension can be usually found as Windows registry files, special files that contain exported registry entries that can be uploaded to the system. |
 scr | Files with scr extension can be most typically found as screensavers for Microsoft Windows operating system. However, never open random .scr files from untrustworthy sources. |
 shs | Files with shs extension are quite often found as special OLE objects (scraps) from various Windows / MS Office apps. |
 tmp | Files with tmp extension are traditionally used for temporary files in Microsoft Windows. In most cases can be safely deleted. |
 vbs | Files with vbs extension can be generally found as scripts made using Visual Basic programming language and development environment. Used in many programs. |
This is a list of some the most common file types from this category and may change in time as the popularity and significance of some formats can change. Whole category of file extensions blocked by mail clients contains now 95 file types. Show all email attachment blocked files.
