How to install/uninstall DLL and AX codec/filter files

Last update: 12 Apr 2014 | 371944 views

1. Unarchive the package and use the files from Release folder if you're running Windows 9x/Me or Release Unicode if you're running Windows 2000/XP.

Or from x86, x64 folders.

2. Copy DLL or AX files in system32 folder [ C: > WINDOWS > system32 ]

3. Click on Start > Run... (type run in the search box)

- To install the files, type: regsvr32 filename.dll or regsvr32

- To uninstall them, use: regsvr32 -u filename.dll or regsvr32 -u

Run dialog box

4. In the end, you should receive a message saying that your file was succesfully installed/uninstalled.

The file was succesfully installed

An easy way to register/unregister [install/uninstall] the files is to use one of these small tools:

- RadLight Filter Manager - list all registered codecs and to register or unregister codecs.
- DirectShow Filter Manager: helps to list, sort, find, add or remove DirectShow filters.
- RegShell - will help you avoid the inconvenience of running regsvr32 from the start menu.
- DllRegSvr - allows to register/unregister DLL and OCX codec files using RegSvr32 tool.
- Emsegister Tool - register dll/ocx filters, codecs... and get extended file informations.
- you can find more under Fix, Repair Tools category.

Some of the more common filters

• "" - WinDVD Audio Decoder filter.
• "" - WinDVD Video Decoder filter.
• "" - PowerDVD Audio Decoder filter.
• "" - PowerDVD Video Decoder filter.
• "DSCinemAudioDecoder.dll" - CineMaster v4 Audio Decoder filter.
• "DSCinemVideoDecoder.dll" - CineMaster v4 Video Decoder filter.

Note: Sometimes you need to specify the fully qualified path name to files (i.e. C: > Program Files > InterVideo > Common > Bin > IVIAUDIO.AX).

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Combining the tips work excellent for installing codecs in Win 7 x64 environment. Place the codec file in the syswow64-folder, start the command prompt run as administrator, go to the syswow64-folder, and... "regsvr32 (or whatever it's called) and hey presto!

Rating: 3 | on 13 Jan 2014, written by: Andreas

Hi. So I was trying to fix a problem with my laptop and was browsing problem reports and solutions. I came across an article which said to unregister SPLITTER.AX, so, like an idiot, I did it. Not to my knowledge, this had something to do with my external monitor, which went off completely. I restarted my computer and now the display is messed up, i.e, it's "shifted" to the right and a large portion of the screen is cut off. Tried everything to fix, tried going to the Command Prompt and typing /regsvr SPLITTER.AX and then I get an error message saying it can't be found. Please help?

Rating: 5 | on 10 Jan 2014, written by: Help

TO INSTALL .ax FILES IN 64-BIT WINDOWS: You MUST specify 64-bit regsvr32 (yes, the 64-bit version has "32" in its name), which you will find in C:\Windows\SysWOW64. Place in C:\Windows\SysWOW64. Then register the splitter with this command line: C:\Windows\SysWOW64\regsvr32 C:\Windows\SysWOW64\ *If you don't specify, the 32-bit version from C:\Windows\SysWOW64\\System32 will be invoked by default and you\'ll get an error message.

Rating: 2 | on 07 Feb 2013, written by: patronanejo

Windows 7 Users! Start > All Programs > Accessories Right Click on Command Prompt and choose run as Administrator In Command Prompt For Installing type: regsvr32 filename.dll or regsvr32 For Uninstalling type: regsvr32 -u filename.dll or regsvr32 -u Should work for Windows 8 people as well, if you can find the command prompt function... %windir%\\system32\\cmd.exe

Rating: 2 | on 17 Dec 2012, written by: Dogan

hi i am using windows 7 64bit and i installed successfully

Rating: 5 | on 17 Jul 2012, written by: adhul

Doesn't work for Windows7. If you all could put in some instructions for installing this into Windows7 that would make my rating for it go up, but as of now I have to rate it as Bad. :(

Rating: 2 | on 15 Apr 2012, written by: VectorRoll

What if you are using the codecs for a 64-bit player, such as MPC-HC x64? I want to do the above in Windows 7 x64. Don't those extension files need to go into the SysWOW64 directory in addition to the system32 folder? In this situation, how would you register/install the 64 bit file? I am trying to get Media Player Classic to play lossless WavPack files using, which also came with, although at the moment I can't remember what I would need the splitter for. I just want MPC-Home Cinema to play WavPack .wv extension files, and it keeps saying "cannot render." Since I have the x64 bit version, I am going to try the above, but use the path name to C:\\Windows\\SysWOW64\\ after RUN regsvr32. We'll see if that register/install(s) it for DirectShow x64 players.

Rating: 3 | on 31 Dec 2011, written by: Nathan

I'm using Windows 7 64bit. I donwloaded the VSFilter-x64, but didn't know what to do.

Rating: 5 | on 11 Mar 2011, written by: Rivo

Excellent guide

Rating: 5 | on 01 Mar 2011, written by: Jasen


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