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

3.7 from 10 Reviews

In order to install DLL and AX files, you need to:

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:


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

To install the files, type:

regsvr32 filename.dll



To uninstall them, use:

regsvr32 -u filename.dll


regsvr32 -u


Run dialog box

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 little 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
Reviews & Comments
on 06 December 2014
add right click context menu, save command below and save as Reg-UnReg.reg

Windows Registry Editor Version 5.00


@="regsvr32.exe \"%L\""

@="regsvr32.exe /u \"%L\""


@="regsvr32.exe \"%L\""

@="regsvr32.exe /u \"%L\""


@="regsvr32.exe \"%L\""

@="regsvr32.exe /u \"%L\""
on 13 January 2014
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!
on 10 January 2014
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?