Why do some .mp3 files not appear in iTunes yet play in other players?

I am running iTunes 6.0.4.2 and use it as my default player in Windows. I have noticed that sometimes I cannot add some .mp3s to my library (they don't appear at all), yet I can play them without problem in Windows Media Player. This is true of both the "Add File" & "Add Folder" options. Can anyone suggest why this is so? Thanks.

Hello,
I have the same problem here in Belgium/Europe after upgrading to iTunes 10.
About 10gb of 310Gb in total is not readable anymore. I use only mp3 320kbps.
You can still find them back in iTunes, but no playback anymore.
I have deleted them from the list and do a "add to library". Impossible to import this data anymore.
What is strange is that this mp3 data can be used in QuickTime Player.
And..the same data is not readable on a another (Windows 7) pc with iTunes 10, neither on a pc with Vista and iTunes 9.2.
Who can help ??

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    I have the same problem here in Belgium/Europe after upgrading to iTunes 10.
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