What are theses files for?

I recently backed up my iTunes music to an external hard drive. I'm getting rid of my old desktop PC and bought a PC laptop. I had (on the old desktop PC) all the music stored under documents>my music.
When I went to sort through the "My Music" folder, that holds all my iTunes music... I found music seperate of a file named "iTunes." Why is this?
Files named:iTunes Library (date).itl I see it says iTunes Database file but what does .itl mean? Do I need that file? I understand it holds data but is it old data I don't need or data that will be useful when I transfered my music to the new computer?
What are the "iTunes Library Extras.itdb" and "iTunes Music Library.xml?"
The reason I'm asking these questions has to do with the fact that I am getting so many duplicates into my new iTunes library.

Yes you need them. The ITL file holds all the organizational information about your library, including playlist and rating information.
Your iTunes library can reference music in any accessible location. It is not necessary for the tracks to be in your iTunes Music folder, although having them there does offer a few advantages.
If you are getting duplicates, it is possible that you have set iTunes to make copies in the iTunes Music folder, and you still have an original outside that folder. Is that what is happening?

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Hello,
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You can just change the extension to CPTX and open it.
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Adobe blog:
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Let's play what are these files? . . . . .

The first file that appeared a month or so ago was:
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What are these files? 5ffffffa900

On my filesystem I have a directory off / called 5ffffffa900 with similarly named directories underneath that.

something to do with windows. I had \\\\\\\.\\\ and had to format my windows partition to get rid of it or try this I finally found to trash the file that would not trash.
pay attention to advanced at lower 1/3
http://docs.info.apple.com/article.html?artnum=106272
You can't empty the Trash or move a file to the Trash in Mac OS X
Last Modified on: April 14, 2006
Article: 106272
In Mac OS X, each user account has a separate, invisible Trash folder that is in the home folder. When you view contents of the Trash, you see only items you placed there and not the Trash folder of any other accounts. If other writable volumes are present, you may also have individual Trash folders on these volumes.
How to delete a file 
1. Drag an item's icon to the Trash (in the Dock), or select the item and press Command-Delete.
2. Choose Empty Trash from the Finder menu.
Tip: If you're trying to delete a file that wasn't completely downloaded or copied, check out this document.
Tip: In Mac OS X 10.3 Panther or later, you can securely delete items by choosing Secure Empty Trash from the Finder menu.
If you change your mind about deleting the item before you choose Empty Trash:
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If you can't empty the Trash or move a file to the Trash
For example, this message might appear when you try to empty the Trash: "The operation could not be completed because the item '(item name)' is locked."
First, try holding the Option key as you choose Empty Trash from the Finder's File menu.
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▪ Do you have correct permissions to modify the file?  Every file and folder in Mac OS X has some permission settings to help define what you or other users can do with the file or folder, for example whether you may modify it or not. If see an alert box with a message that says you do not have "sufficient" privilege or permission, see the tips in the "Emptying the Trash" section of "Mac OS X: Troubleshooting Permissions Issues".  
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Deleting locked files
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If a file can't be unlocked, you may not have permission to unlock it. See "Mac OS X: Troubleshooting Permissions Issues" to learn how to get write permissions.
If the issue persists, use Disk Utility's Repair Permissions feature to check your Mac OS X volume. For Mac OS X 10.1.5 only, download and use Repair Privileges Utility 1.1 instead.
Advanced tip about deleting locked files
If there are several locked files in the Trash, you can unlock them all at the same time at the command line. Follow these steps:
1. Open Terminal. It's located in /Applications/Utilities.  Type: chflags -R nouchg  Note: Type one space (not pictured) after nouchg in the line above, so that it ends in "nouchg ". Do not press Return yet. 
2. Double-click the Trash icon in the Dock to reveal the contents of the Trash. If necessary, arrange the Finder window so that a portion of the Terminal window is still visible.
3. Press the Command-A key combination to select all files in the Trash.
4. Drag the files from the Trash to the Terminal window.  Note: This automatically enters the pathname for each file. This eliminates the need to individually empty multiple Trash directories, particularly when multiple disks or volumes are present. 
5. Press Return. No special text message will be shown indicating that the command was successful.
6. Empty the Trash.
If the Trash does not empty or if you see a message in Terminal that says "usage: chflags [-R [-H | -L | -P]] flags file..." you most likely did not type the text in step 2 as indicated or did not leave a space. Repeat the steps if this happens.

What are these files? _VUC69~7

On my network disk, MyBook World Edition white light 1To, I often find visible files named: _VUC69~7
Any idea where are coming from these?
Shouldn't be hidden files from the Finder?
Why are they visible then?
Thanxx for any clue.
PS: I'm trashing them. They do not seem to play any role, well untill know.

HI Patrick,
Go here and read the post by, "Limnos" ..
http://discussions.apple.com/thread.jspa?threadID=1847980
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Hi and welcome to the forum Xinerama!
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ThinkPads:- T400[Win 7], T60[Win 7], IBM 240[Win XP]
IdeaPad: U350
Apple:- Macbook Air [Snow Leopard]
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What are theses files for?

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