OLK1FD Folder

When I save files from email (outlook) it defaults to C:D&S:John:Local Settings:Temporary InternetFiles:OLK1FD.
could someone tell me what that folder is "OLK1FD" and if necessary to clean it up.
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That is the secure temporary file location for attachments received in Outlook.  See this MSKB article:

Another web page mentioning the OLK1 folder:


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