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List of common dangerous and malicious file extensions

These files are not dangerous by them self, but viruses and other malware often use these extensions to confuse and deceive the user to open them. Always recheck these files before you execute them.

Common possibly dangerous files may change in time as the popularity and significance of some formats can change.
Whole category of possibly dangerous files contains now 133 file types. Show all dangerous and malicious file types.

bat file icon bat 

Files with bat 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.


Files with bin extension can also be found as various programs executables in Windows and Linux.

chm file icon chm 

A chm file extension is related to Microsoft compiled HTML help file format. CHM is acronym for Compiled Help Modules.

class file icon class 

A class file extension is related to the Java programming language and used for compiled Java source codes known as Class bytecode files.

com file icon 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.

cpl file icon cpl 

A cpl file extension is related to the Microsoft Windows operating system. A cpl file stores settings of Windows Control Panel applets.

dll file icon dll 

Files with dll suffix can be commonly found as dynamic link libraries for Microsoft Windows system and apps. These files act as modules with additional runtime routines or data.

drv file icon drv 

Files with drv extension are commonly found as device drives, especially in older versions of Windows operating system. Used for system purposes.

exe file icon exe 

An exe file extension is traditionally used for main executable files since the times of MS-DOS. It was adopted for executables in Windows as well. Executables are files that launch programs.

jar file icon jar 

A jar file extension is commonly used for Java archives, which often contain applets or applications. Used for java application distribution/installation purposes.

js file icon js 

Files with js extension can b commonly found as JavaScripts. Used to execute scripts on internet pages and such.


An lnk file extension is used for files that represent Windows shortcut to a program installed on computer. Every time you create a shortcut a new lnk file is created that acts as the actual link, that can be further customized with various settings as launch parameters, icon etc. Most lnk files are located on user's desktop.

ocx file icon ocx 

An ocx file extension is associated with the Microsoft ActiveX Control items. An OCX is an OLE custom control (program) that is used by various Windows applications to provide such function as handling scroll bar movement and window resizing.

pcx file icon pcx 

Files with pcx extension can be commonly found as bitmap pictures saved in old Paintbrush program. Can be opened in most modern graphic editors.

scr file icon scr 

The scr file extension is associated with screensavers created for Microsoft Windows operating system.

shs file icon shs 

An shs file extension is also related to Microsoft Windows Shell Scrap Object file format. An shs scrap file is a special OLE object that can be insert into documents.

swf file icon swf 

A swf file extension is commonly used for Shockwave Flash movies in animated vector format, used mainly on Internet web sites. Adobe Flash Player can play .swf files.


Files with sys extension can be often found as various system files in DOS and Windows operating system. They contain information needed to properly load and configure operating system. A corrupted or missing system file can cause the system to be unstable or unable to boot.

vbs file icon vbs 

Files with vbs suffix can be generally found as scripts made using Visual Basic programming language and development environment. Used in many programs.

vxd file icon vxd 

Files with vxd extension can be mostly found as virtual device drivers from Microsoft Windows operating system.

wmf file icon wmf 

Files with wmf extension can be found as pictures in Windows Metafile Format. WMF is a 16-bit format introduced in Windows 3.0; a newer 32-bit version with additional commands is called Enhanced Metafile (EMF).

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 possibly dangerous files contains now 133 file types. Show all dangerous and malicious files.

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