Replace not latin characters from file name.

Dear friends,
I tried a lot but even after reading the documentation about all the available CF functions I could not find a way to accomplish this:
As you already know from my previous post I'm trying to finish an application which manages multiple images. I have reached a really good point and I was ready to implement the solutions you suggest on this post when the client did something marvellous. He uploaded some images named "Εικόνα 123.jpg" (Image 123.jpg in English) which actually broke the Flex application that retrieves the images because the firewall does not allow high bit characters to go through. I now need to add a function that will evaluate every character in the file name individually and it will remove or replace (I do not care) all the characters that are not latin or numbers (spaces, greek characters, special characters, etc). As I've already said no known function is able to do that (as far as I know of course) and I guess that the solution could be hiding in regular expressions which is not my strong point. So I need your help here.
Thank you in advance,
John

Thanks Ian,
I cannot figure out how to use asc() function for this. I will have to run a test in every single character and replace the invalid ones but I will never now the actual string length (how many characters each image name will have) and I will possibly end up destroying the extensions (.jpg) as well. To make it a little more complicated let me tell you that I will have to run this twice. Once for the full image path (ie d:\company\aptown\images\Εικόνα 123.jpg) in which I will have to change only the ...Εικόνα 123... part and not anything else, and once for a comma separated list of the image names (ie Εικόνα 123.jpg, Εικόνα 124.jpg, Εικόνα 125.jpg, Εικόνα 126.jpg). And don't be misleaded from the pattern. The customer may upload an image named with a complitely different way using invalid characters though, for example "Αντίγραφο της Εικόνας 123.jpg" (Copy of the image 123.jpg in English).
Seems to be impossible ,
I hope it is not.
Yannis

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Disclaimer: Apple does not necessarily endorse any suggestions, solutions, or third-party software products that may be mentioned in the topic below. Apple encourages you to first seek a solution at Apple Support. The following links are provided as is, with no guarantee of the effectiveness or reliability of the information. Apple does not guarantee that these links will be maintained or functional at any given time. Use the information below at your own discretion.
Symptoms
While upgrading or uninstalling a Windows software application (such as iTunes for Windows or QuickTime for Windows), you may receive one of the following error messages:
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Resolution
The error messages are usually caused by damage to the installation database for the application. Clearing the installation database for the application by using the Windows Installer CleanUp utility can usually get you past the error message.
(1) Click [here|http://support.microsoft.com/kb/290301] first, and read the important information about the utility.
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(5) Select the software you're getting the "not a valid short file name" or "invalid character" message for from the list and click Remove.
(6) Click OK in the confirmation dialog that appears.
(7) If you have multiple entries for the software you're getting the "not a valid short file name" or "invalid character" message for, repeat steps 5 and 6 for the other entries for the software.
(8) Click Exit.
(9) Restart the computer.
If you were getting the "not a valid short file name" or "invalid character" message when trying to upgrade or launch software, now try reinstalling the latest version of the software.
If you were getting the "not a valid short file name" or "invalid character" message when just trying to uninstall software, program files for the software in question will remain on the PC after it has been removed by the Windows Installer CleanUp utility. If you want to remove leftover program files, check in at the appropriate forum at [Apple Discussions|http://discussions.apple.com/index.jspa?categoryID=1] and ask which files can be safely removed.
This is the 1st version of this tip. It was submitted on March 24, 2010 by b noir.
Do you want to provide feedback on this User Contributed Tip or contribute your own? If you have achieved Level 2 status, visit the User Tips Library Contributions forum for more information.

Go to Microsoft website to fix installer file problems.
Click "Run now" from Fix it to remove all iTunes & related installer files:
http://support.microsoft.com/mats/Program_Install_and_Uninstall
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Replace not latin characters from file name.

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