VersionsVersions 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


iobitsmartdefragextension.dll has 5 known versions, the most recent one is It adds a context menu to the Window's shell named SmartDefragExtension. The average file size is about 114.32 KB. It is an authenticode code-signed executable issued to IObit Information Technology by the certification authority VeriSign. Some variations of the file have been seen to be installed with the program DRIVERfighter from SPAMfighter ApS..


File name:iobitsmartdefragextension.dll
Product name:Smart Defrag
Description:IObit Smart Defrag Extension
Typical file path:C:\Windows\System32\iobitsmartdefragextension.dll
Issued to:IObit Information Technology
Authority (CA):VeriSign
Expiration date:Sunday, February 14, 2016

ResourcesPrograms installed in

(Note, the programs listed below are for all versions of Smart Defrag.)
SPAMfighter ApS.
45% remove
DRIVERfighter is typically bundled with 3rd party pay per install programs such as InstallIQ.


(Note, the behaviors below are for all versions of iobitsmartdefragextension.dll, select a unique version for 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}

VersionsAll file variations of iobitsmartdefragextension.dll

MD5SHA-1File size
7d1ca4a2c5bcb0857643f6bf3b5f4444 ff63a2a68cc2aa4417cfb3c78ca553c162e6ff49 101 KB
96886de2c4ceb437bd6b622b9573e199 34329436161b9a61afc551177f176cdc5c1de0ea 101 KB
6a6e91c06acdbe1d85a4ec469bbb8ebb 94b0fad5615bbea8c957619e52ded97e3d6ffd42 119 KB
84e8b979bbbdd23ad84e88fd12236306 75ae78219871284536df4ff085a8f367bd91185d 125.28 KB
40a281a59e0e414059181cc71ce3561a f88b2cb82deeda272fec698800e26a93cc527eee 125.31 KB

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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