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What is cdfview.dll?

Part of Channel Definition File Viewer by Microsoft

What is it?

Client/Server Runtime Subsystem, or csrss.exe, is a component of the Microsoft Windows NT operating system that provides the user mode side of the Win32 subsystem and is included in Windows 2000, XP, 2003, Vista, Server 2008 and 7. Because most of the Win32 subsystem operations have been moved to kernel mode drivers, in Windows NT 4 and later CSRSS is mainly responsible for Win32 console handling and GUI shutdown.

What if I disable Channel Definition File Viewer?

It is critical to system operation; therefore, terminating this process will result in system failure. Under normal circumstances, CSRSS cannot be terminated with the taskkill command or with Windows Task Manager, though it is possible in Vista if the Task Manager is run in Administrator mode. On Windows 7, Task Manager will inform the user that terminating the process will result in system failure, and prompt if they want to continue.
Description of cdfview.dll from Microsoft
CSRSS runs as a user-mode system service. When a user-mode process calls a function involving console windows, process/thread creation, or Side-by-Side support, instead of issuing a system call, the Win32 libraries (kernel32.dll, user32.dll, gdi32.dll) send an inter-process call to the CSRSS process which does most of the actual work without compromising the kernel. Window manager and GDI services are handled by a kernel mode driver (win32k.sys) instead. The Windows NT 3.x series of releases had placed the Graphics Device Interface component in CSRSS, but this was moved into kernel mode with Windows NT 4.0 to improve graphics performance. The Windows startup process has changed significantly since Vista. 2 instances of csrss.exe are running in Windows 7 and Vista.
(cdfview.dll is a system file that is installed with Windows)
Download Boost and enjoy your PC. Speed up Channel Definition File Viewer and optimize your PC.

How is cdfview.dll loaded?

Approved shell extension - cdfview.dll has a CLSID (globally unique identifier) of {f39a0dc0-9cc8-11d0-a599-00c04fd64433} with and identifier of Channel File. When the system detects that the user is downloading an external program that runs as part of the Windows user interface, the system searches for a digital certificate or requests that the user approve the action. If you enable this policy, Windows only starts approved programs.


What is the community is seeing?What is the community is doing?
About 0.3% of all Boost users have the cdfview.dll file.Of the 0.3% of cdfview.dll users, less than 1% have disabled it.
Typical file (disk image) location:

Are there other versions of Channel Definition File Viewer?

What else is related?

What Windows OS versions does this run on?

Microsoft Windows XP (5.1.2600.131072)

About Microsoft Corporation

Microsoft, founded in 1975 by Bill Gates and Paul Allen, is a veteran software company, best known for its Microsoft Windows operating system and the Microsoft More...
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File details

File name: cdfview.dll
Publisher: Microsoft Corporation (verified)
Name: Channel Definition File Viewer
Description: Microsoft® Windows® Operating System
Version: 6.00.2900.2904 (xpsp.060509-0230)
Product version: 6.00.2900.2904
Size: 147.5 KB
Original file name: CDFVIEW.DLL
Windows file protection: Yes

Approved shell extension details

CLSID: {f3ea0dc0-9cc8-11d0-a599-00c04fd64438}
Command: Channel Properties

Image hashes

MD5: cc2b9db3f77bb486c94783ef5d367d90
SHA-1: 3c87d46f302a4c15317bb4008f27eb9b8e4377d0

PE image details

File entropy: 6.21415
File packed: No
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