The file probably is a temp file.....go to My Computer >> Tools >> View >> Uncheck "Hide file extensions for known file types" >> Press OK....then you should be able to see the file`s extension....POST the full file name then....
24GB is a large file. Could be a backup/image file. Is there a file extension? If not you need to change the global settings in WinXP to show file extensions for common file types. This is part of WinXP's effort to dumb down the OS.
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