84,488,480 programs installed

Should I remove A4S Scanner?

What percent of users and experts removed it?
9% remove it91% keep it
Overall Sentiment
What do people think about it?
Be the first to rate (click star to rate)
How common is it?
Reach 0.0003%


1.02.0003 100.00%

A4S Scanner


A4S Scanner is a software program developed by Penpower Co ltd. The setup package generally installs about 4 files and is usually about 2.54 MB (2,658,304 bytes). Relative to the overall usage of those who have this installed, most are running it on Windows 7 (SP1). While about 75% of users of A4S Scanner come from the United States, it is also popular in Canada and Thailand.

Program detailsProgram details

Installation folder: C:\Program Files\penpower\worldocscan400
Uninstaller: MsiExec.exe /X{5ED5B784-AED3-474E-8CD6-ABE3E60793FD}
(The Windows Installer is used for the installation, maintenance, and removal.)
Estimated size: 2.54 MB
Language: English (United States)

Program filesFiles installed by A4S Scanner

  • wlds400w.dll (by Document Capture Technologies) - DCT Dynamic Link Library (DCT WIA DLL)
  • wlds400.dll (by Document Capture Technologies) - Scanner library
  • wlds400-32.dll
  • wlds400u.dll - Scanner UI DLL

How do I remove A4S Scanner?

You can uninstall A4S Scanner 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 A4S Scanner, 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 A4S Scanner.

Uninstall it 9%
Keep it 91%
Windows 7 (SP1)
United States

Distribution by countryGeography

75.00% of installs come from the United States
Which countries install it?
  United States 75.00%
  Canada 8.33%
  Thailand 8.33%
  TT 8.33%

OEM distributionPC manufacturers

What PC manufacturers (OEMs) have it installed?
Lenovo 33.33%
Acer 33.33%
Toshiba 16.67%
Common models
TOSHIBA Satellite L670 16.67%
LENOVO 2537CTO 16.67%
LENOVO 20DF0030US 16.67%
Gigabyte G31M-ES2C 16.67%
Gateway NV56 Series ... 16.67%
Acer Aspire 5532 16.67%


user comment
No one has commented yet. Help others learn more about this software, share your comments.