Should I block it?

40% of PCs block this file from running.
Possible reason:
Performance resource utilization

VersionsAdditional versions 2.70% 8.11% 2.70% 83.78% 2.70%
(Note, IObit Information Technology publishes each variation of this file with the same version, but the hashes are unique.)



Smart Defrag by IObit Information Technology (Signed)

Remove IObitSmartDefragExtension.dll
MD5:   6a6e91c06acdbe1d85a4ec469bbb8ebb
SHA1:   94b0fad5615bbea8c957619e52ded97e3d6ffd42


iobitsmartdefragextension.dll is loaded as dynamic link library that runs in the context of a process. The file is digitally signed by IObit Information Technology which was issued by the VeriSign certificate authority (CA).


File name:iobitsmartdefragextension.dll
Product name:Smart Defrag
Description:IObit Smart Defrag Extension
Typical file path:C:\Windows\System32\iobitsmartdefragextension.dll
File version:
Size:119 KB (121,856 bytes)
Build date:1/8/2014 2:54 AM
Issued to:IObit Information Technology
Authority (CA):VeriSign
Expiration date:Sunday, February 14, 2016
Digital DNA
PE subsystem:Windows GUI
File packed:No
More details


Context menu handlers
Located in '*\shellex\ContextMenuHandlers'
  • Name: 'SmartDefragExtension'
Approved shell extensions
Located in the registry at 'SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved'
  • 'IObitSmartDefrag Extension' with CLSID {189F1E63-33A7-404B-B2F6-8C76A452CC54}

Windows OS versionsDistribution by Windows OS

OS versiondistribution
Windows 7 Home Premium 40.54%
Windows 7 Ultimate 18.92%
Windows 8.1 13.51%
Windows 8.1 Pro with Media Center 8.11%
Windows 8.1 Pro 5.41%
Windows 7 Professional 5.41%
Windows 8 5.41%
Microsoft Windows XP 2.70%

Distribution by countryDistribution by country

United States installs about 62.16% of Smart Defrag.

OEM distributionDistribution by PC manufacturer

PC Manufacturerdistribution
Dell 36.36%
Acer 22.73%
Hewlett-Packard 18.18%
Sony 9.09%
Toshiba 9.09%
ASUS 4.55%
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