I agree that a fix is better than a work-around... if I take my ffdshow
codec out of the picture, MJPEG files still play.

WMP plays them with pvmjpeg30.dll file in the system32 folder... check that
it's there and try re-registering it in case it slipped a gear.
--
website references are to www.papajohn.org

PapaJohn


"zachd [MSFT]" <zachd@nomailplz.online.microsoft.com> wrote in message
news:uTawOgGZIHA.1212@TK2MSFTNGP05.phx.gbl...
>
> What's the URL that Web Help takes you to?
>
> There's already an MJPEG codec on the system. It should work. PapaJohn's
> suggestion might help you replace it if needed though, but that shouldn't
> be needed.
> AVI vs avi doesn't matter - the system is case-insensitive here.
>
> --
> Speaking for myself only.
> See http://zachd.com/pss/pss.html for some helpful WMP info.
> This posting is provided "AS IS" with no warranties, and confers no
> rights.
> --
> "John Hanley" <jphanley@ix.netcom.com> wrote in message
> news:esWycIFZIHA.4896@TK2MSFTNGP06.phx.gbl...
>>I have a Canon S3IS digital camera which can take movies. The movies
>>show
>> an .AVI extension and (I think) use an MJPEG codec. After transferring
>> the
>> movie files to my (Vista) hard drive, their behavior is erratic:
>>
>> - The movie files *will not* play in Windows Media Player. The WMP
>> error
>> message is: "Windows Media Player encountered a problem while playing
>> the
>> file". Clicking on Web Help reveals: "You've encountered error message
>> C00D11B1 while using Windows Media Player."
>>
>> - The movie files *will not* play in Windows Media Center; WMC says
>> "Cannot
>> Play Video - Windows Media Center cannot open the file".
>>
>> - If I import the files into Windows Movie Maker, WMM appears to play
>> them,
>> but the preview screen is black.
>>
>> - GSpot reports that the file is a Motion JPEG, and that "Codec(s) are
>> Installed".
>>
>> - The movie files *will* play using Canon's ZoomBrowser EX program (came
>> with the camera).
>>
>> Related Info:
>>
>> - Both WMP & WMC play my .wmv files just fine. I also have one .avi file
>> from a different source which plays fine.
>> - The file extension on the AVI files that will not play is .AVI
>> (capitalized); the file extension on the avi file that will play is .avi
>> (lower case) -- probably does not matter?
>>
>> Will appreciate clues on where to look to solve the issue. Thanks.
>>
>>
>
>