84,488,480 programs installed

Should I remove CAJViewer?

What percent of users and experts removed it?
3% remove it97% keep it
Overall Sentiment
Very good
What do people think about it?
Be the first to rate (click star to rate)
How common is it?
Global Rank #22,118
United States Rank #27,513
Reach 0.0090%


7.2.1 6.21%
7.2 76.84%
7.1.2 13.56%
7.0.2 2.82%
7.0.0 0.56%



CAJViewer is a software program developed by TTKN. The most common release is 7.2, with over 98% of all installations currently using this version. Upon being installed, the software adds a Windows Service which is designed to run continuously in the background. Manually stopping the service has been seen to cause the program to stop functing properly. It adds a background controller service that is set to automatically run. Delaying the start of this service is possible through the service manager. The software is designed to connect to the Internet and adds a Windows Firewall exception in order to do so without being interfered with. The primary executable is named cajviewer.exe. The setup package generally installs about 31 files and is usually about 8.01 MB (8,396,866 bytes). Relative to the overall usage of users who have this installed on their PCs, most are running Windows 7 (SP1) and Windows 10. While about 47% of users of CAJViewer come from China, it is also popular in the United States and Taiwan.

Program detailsProgram details

URL: cajviewer.cnki.net
Installation folder: C:\Program Files\ttkn\cajviewer 7.1
Uninstaller: MsiExec.exe /I{38CE8FAD-2E31-4CA8-B671-1BA7A8A54B28}
(The Windows Installer is used for the installation, maintenance, and removal.)
Estimated size: 8.01 MB
Language: Chinese (Simplified, PRC)

Program filesFiles installed by CAJViewer

Program executable:cajviewer.exe
Name:CAJViewer 7.1
CNKI® CAJViewer 7.1
Path:C:\Program Files\ttkn\cajviewer 7.1\cajviewer.exe
Additional files:
  • cajvieweru.exe (by Tongfang Knowledge Network Technology(Beijing) Co) - CAJViewer 7.2 (CNKI® CAJViewer 7.2)
  • autoupgrade.exe (by Tongfang Knowledge Network Technology(Beijing) Co) - AutoUpgrade 1.0
  • cajshost.exe - TTKN®CAJHost
  • pdl.exe - PDL 2.1 (CNKI® PDL 2.1)
  • sysinfoax.ocx - TTKN®SysInfo Library
  • ui.dll - UI Library (CNKI® User Interface Runtime Library)
  • whelperu.dll - TTKN Word Helper (CNKI® Word Helper)
  • clientcc.dll (by Tsinghua Tongfang Optical Disc Co.,Ltd) - TTOD R&D clientcc (clientcc)
  • DLMngr.exe - DLMngr
  • mail.dll - TTKN Mail Helper (CNKI® Mail Helper)
  • mailu.dll
  • swords.exe
  • uiu.dll
  • whelper.dll

Program behaviorsBehaviors exhibited

  • cajshost.exe runs as a service named 'CAJ Service Host' (CAJ Service Host).
2 Windows Firewall Allowed Programs
  • pdl.exe is added as a firewall exception for 'C:\Program Files\TTKN\CAJViewer 7.2\PDL.exe'.
  • CAJViewer.exe is added as a firewall exception for 'C:\Program Files\TTKN\CAJViewer 7.0\CAJViewer.exe'.

How do I remove CAJViewer?

You can uninstall CAJViewer from your computer by using the Add/Remove Program feature in the Window's Control Panel.
  1. On the Start menu (for Windows 8, right-click the screen's bottom-left corner), click Control Panel, and then, under Programs, do one of the following:
    • Windows Vista/7/8/10: Click Uninstall a Program.
    • Windows XP: Click Add or Remove Programs.
  2. When you find the program CAJViewer, click it, and then do one of the following:
    • Windows Vista/7/8/10: Click Uninstall.
    • Windows XP: Click the Remove or Change/Remove tab (to the right of the program).
  3. Follow the prompts. A progress bar shows you how long it will take to remove CAJViewer.

Win 7 (SP1) 51%
Win Vista (SP2) 1%
Windows Service? Yes
(Installs a service)
Uninstall it 3%
Keep it 97%

Windows OS versionsWindows

Which Windows OS versions does it run on?
Windows 7 55.93%
Windows 10 37.85%
Windows XP 5.08%
Windows Vista 1.13%
Which OS releases does it run on?
Windows 7 Ultimate 35.43%
Windows 8.1 Pro 7.43%
Windows 7 Professional 7.43%
Windows 8.1 7.43%
Windows 10 Pro 6.86%
Windows 7 Home Premium 5.14%

Distribution by countryGeography

46.81% of installs come from China
Which countries install it?
  China 46.81%
  United States 28.72%
  Taiwan 4.79%
  Hong Kong 4.26%
  United Kingdom 3.19%
  Malaysia 2.66%
  Canada 2.13%
  Italy 1.60%
  France 1.06%
  Singapore 0.53%
  Thailand 0.53%
  Korea 0.53%
  Russia 0.53%
  Portugal 0.53%

OEM distributionPC manufacturers

What PC manufacturers (OEMs) have it installed?
Lenovo 28.30%
Acer 24.53%
Dell 23.58%
ASUS 12.26%
Hewlett-Packard 7.55%
Sony 2.83%
Alienware 0.94%
Common models
Dell Dell System Inspir... 2.00%
Acer Aspire 4741 2.00%
ASUS All Series 2.00%
LENOVO IdeaPad Y460... 2.00%
Apple Inc. MacBookPro11,3 1.00%
Alienware Alienware 17 1.00%


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