They do indeed. Example below, maybe the problem would be more obvious seeing the data...
<?wpl version="1.0"?>
<smil>
<head>
<meta name="Generator" content="Microsoft Windows Media Player -- 10.0.0.4074"\>
<author\>
<title>Xmas Party<\title>
<\head>
<body>
<seq>
<media src="V:\Music\Aerosmith\Big Ones\02 - Aerosmith - Love in an Elevator.mp3" cid="{FE337856-23FF-4646-B2BD-3AD9A4DF664D}" tid="{A8719060-E78D-4BF0-AF48-92853C0FEE9B}"\>
<media src="V:\Music\Amy MacDonald\This Is the Life\01_Mr. Rock & Roll.mp3" cid="{86B38D00-8E86-4091-A8C5-E88B9D2E151D}" tid="{2806578F-EE2A-4A78-B0C3-DC43AFB25AEE}"\>
<media src="V:\Music\Arctic Monkeys\Whatever People Say I Am, That's What I'm Not\02 I Bet You Look Good on the Dancef.mp3" cid="{8A988097-FDB7-4D9A-AECD-AA45E74571D6}" tid="{B7445EA8-9868-4765-9D6F-4E2120B5AC45}"\>
<media src="V:\Music\Aretha Franklin\Greatest Hits [Global TV] Disc 1\02 Respect.mp3" cid="{26AD55A6-E924-4E49-BA1C-62502DC086EA}" tid="{9060F64A-B9D4-465B-81D1-F585A453C7E1}"\>
<\seq>
<\body>
<\smil>