Should I block it?
No, this file is 100% safe to run.
 
 Additional versions
Additional versions
 
Relationships
     
    
        shellext.dll
Microsoft Security Essentials Shell Extension by Microsoft Corporation (Signed)
| Version: | 4.2.0216.0 | 
| MD5: | d9ed4e24723880f608c62e2e00430bdd | 
| SHA1: | 83577420f6596eb3cf732036c0cfd8294b16f71e | 
Overview
shellext.dll is loaded as dynamic link library that runs in the context of a process. The file is digitally signed by Microsoft Corporation.
 Details
Details
| File name: | shellext.dll | 
| Publisher: | Microsoft Corporation | 
| Product name: | Microsoft Security Essentials Shell Extension | 
| Typical file path: | C:\Program Files\microsoft security essentials\shellext.dll | 
| Original name: | ShellExt.exe.mui | 
| File version: | 4.2.0216.0 | 
| Size: | 265.67 KB (272,048 bytes) | 
| Certificate | 
| Issued to: | Microsoft Corporation | 
| Authority (CA): | Microsoft Corporation | 
| Effective date: | Monday, July 13, 2009 | 
| Expiration date: | Wednesday, October 13, 2010 | 
| Digital DNA | 
| Entropy: | 5.534282 | 
| File packed: | No | 
| .NET CLR: | No | 
More details
 Behaviors
Behaviors
Context menu handlers
Located in '*\shellex\ContextMenuHandlers'
Approved shell extensions
Located in the registry at 'SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved'
- 'EPP' with CLSID {09A47860-11B0-4DA5-AFA5-26D86198A780}
 Distribution by Windows OS
Distribution by Windows OS
| OS version | distribution | 
| Windows 7 Home Premium | 57.00% |  | 
| Windows 7 Ultimate | 17.00% |  | 
| Windows 7 Professional | 10.50% |  | 
| Microsoft Windows XP | 9.50% |  | 
| Windows Vista Home Premium | 5.00% |  | 
| Windows Vista Ultimate | 1.00% |  | 
 Distribution by country
Distribution by country
United States installs about 52.50% of Microsoft Security Essentials Shell Extension.
 Distribution by PC manufacturer
Distribution by PC manufacturer
| PC Manufacturer | distribution | 
| Dell | 29.12% |  | 
| Hewlett-Packard | 14.94% |  | 
| ASUS | 13.03% |  | 
| Acer | 10.34% |  | 
| Toshiba | 6.13% |  | 
| Sony | 6.13% |  | 
| Intel | 4.60% |  | 
| Lenovo | 3.83% |  | 
| Compaq | 3.07% |  | 
| GIGABYTE | 1.92% |  | 
| Gateway | 1.53% |  | 
| MSI | 1.53% |  | 
| NEC | 1.53% |  | 
| Samsung | 0.77% |  | 
| Sahara | 0.77% |  | 
| American Megatrends | 0.77% |  |