Plugins Needed in Ubuntu 9.10

I was trying to play a .wav file in 64-bit Ubuntu 9.10 (Karmic Koala).  (This was a compressed .wav in 4-bit 22 kHz IMA ADPCM format.)  I double-clicked on it in Nautilus.  Movie Player opened up and gave me this message:

Search for suitable plugin?

The required software to play this file is not installed.  You need to install suitable plugins to play media files.  Do you want to search for a plugin that supports the selected file?

The search will also include software which is not officially supported.

I went with that.  Unfortunately, the next message said this:

No packages with the requested plugins found.

The requested plugins are:

image/vnd.microsoft.icon decoder

I clicked OK.  That gave me another message:

An error occurred

The playback of this movie requires a image/vnd.microsoft.icon decoder plugin which is not installed.

A search for relevant terms led to a thread in which someone asked whether the user had "the w32codecs" installed.  I didn't see that package in Synaptic.  But then someone else in that thread said maybe I wouldn't need it for my 64-bit Ubuntu.  One person pointed toward an extended tutorial in setting up multimedia in Ubuntu.  There was some discussion on whether 32-bit codecs (e.g., w32codecs) were necessary in a 64-bit system; the consensus (supported, of course, by the actual error message on my system) was that they might well be.  The same opinion emerged in another discussion .  The way to get those 32-bit codecs seemed to be, first, to add the Medibuntu repository to my Ubuntu installation.  The simple way to do this was to cut and paste this command into Terminal:

sudo wget --output-document=/etc/apt/sources.list.d/medibuntu.list http://www.medibuntu.org/sources.list.d/$(lsb_release -cs).list && sudo apt-get --quiet update && sudo apt-get --yes --quiet --allow-unauthenticated install medibuntu-keyring && sudo apt-get --quiet update

all on one line.  For additional multimedia options and capabilities and such, it was also recommended that I enter these commands:

sudo apt-get --yes install app-install-data-medibuntu apport-hooks-medibuntu

sudo apt-get install libdvdcss2

sudo apt-get install w64codecs

So I did that.  This all went smoothly.  I was now able to play other .wav files, but I was not able to play that particular one.  I tried playing it in Windows, using IrfanView, and got these error messages:

[filename]:  Can't read file header !

Unknown file format or file not found !

IrfanView: i_view32.exe - Corrupt File

The file or directory [filename] is corrupt and unreadable.  Please run the Chkdsk utility.

So possibly that was why Ubuntu had been unable to play it.  I had checked its properties in Ubuntu, but had not seen any such message.