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

.
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

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