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Microsoft Windows will use a tilde (~) when truncating a long to a short file name. There is a .NET vulnerability in IIS when referencing pages using the short filename that can be used by a hacker in a denial of service (DOS) attack against the website.
The short file names used for files within the IIS folder (inetpub) can be stripped away to remove this vulnerability on the Enterprise Vault server without causing any negative impact to the Enterprise Vault processes. For more details review here.