How did all these .wav files get on my system?

[joe at actionline.com]

.
Today, I discovered several dozen .wav files in several different places
on my system, including here: /home/joe/.ooo3/user/gallery

These files have many different dates from June of this year through the
current date and I did not intentionally download any of these files, nor
do not recall ever previously hearing any of them.  So how did they get on
my system and why are they in an open office subdirectory?

  493876 2010-06-16 07:02 Sentimental Journey.wav
  651777 2010-06-17 15:07 Blade runner.wav
  376594 2010-06-17 15:07 Bilitis Pourcel bonita.wav
  147840 2010-06-20 14:07 rouge-gorge-1.wav
  140654 2010-06-20 14:07 Pinson.wav
  122820 2010-06-20 14:07 Chardonneret.wav
   84178 2010-06-20 14:07 Alouette.wav
  100140 2010-06-20 14:07 Hirondelle.wav
  154572 2010-06-20 14:07 Moineau.wav
   64608 2010-06-20 14:07 Mouette.wav
   97708 2010-06-20 14:07 Verdier.wav
   84264 2010-06-20 14:07 Fauvette.wav
   97116 2010-06-20 14:07 Goeland.wav
  193522 2010-06-20 14:08 Mesange charbonniere bis.wav
   29854 2010-06-20 14:08 bruitage chouette bis.wav
   72865 2010-06-20 14:08 Coucou bis.wav
   31195 2010-06-20 14:08 geai-bleu bis.wav
  165961 2010-06-20 14:08 Grand_duc bis.wav
  170608 2010-06-20 14:08 merle bis.wav
   88548 2010-06-20 14:08 Pic Vert.wav
   93840 2010-06-20 14:08 Rossignol bis.wav
  402568 2010-07-13 21:11 louie.wav
  296210 2010-07-13 21:12 cherry_pie.wav
  333854 2010-07-13 21:12 blue_suede_shoes.wav
  371090 2010-07-13 21:12 DannyAndTheJrsAtTheHop.wav
  153790 2010-07-14 08:20 AndyWilliamsSummerPlace1.wav
  636381 2010-08-02 19:56 Beat the drum slowly.wav
   23584 2010-08-03 16:49 explode.wav
  305062 2010-08-03 16:49 Track04aa rose of china.WAV
 1652190 2010-08-06 04:12 marine corp ymn.wav
  828550 2010-08-08 21:07 polka kuschel-polka.wav
 2014268 2010-08-27 09:40 He's My Brother.wav
  443374 2010-08-29 20:25 Giovanni-1920.wav
  539496 2010-09-04 21:22 Bride in sep 2.wav
  566854 2010-09-09 13:46 Amazing-Cornemuse-2.wav
  272112 2010-09-10 06:54 Ern Cortazar Stolen kiss.wav
  206148 2010-09-13 07:03 AmericanBandstand[1].wav
  337550 2010-09-13 07:03 Do You Remember wav.wav
  484498 2010-09-13 07:03 AprilLove  Pat Boone.wav
 1095042 2010-10-02 08:30 Arabesque Clayderman.wav
  533820 2010-10-02 08:53 ??? ???? ???.wav
  212758 2010-10-06 07:38 zamfir_aranjuez mon amour.wav
  527617 2010-10-15 11:15 Patsy Cline - Gospel.wav
  268258 2010-10-20 06:42 Spa-Moods-Along-in-the-night.wav
  541030 2010-10-24 06:47 Solace (The Sting).wav
 2050160 2010-10-27 06:17 Bandas peliculas ghost.wav
  600470 2010-10-31 12:16 The Rose.wav
  997978 2010-11-07 09:16 Oasis de Kitaro.wav

In addition to all the .wav files, in the same subdirectory I see several
other files and I don't know what those files are, what they are for, or
how to check their contents:

     538 2010-02-15 12:56 sg100.thm
    2048 2010-02-15 12:56 sg100.sdv
   20325 2010-11-07 09:16 sg30.sdg
    3022 2010-11-07 09:16 sg30.thm
    2048 2010-11-07 09:16 sg30.sdv