An exploit is a short code or script that uses a vulnerability to perform malicious actions.
The HTML.Mht exploit is embedded to HTML web pages. It attempts to download and install a malicious program on your computer by using a security vulnerability in Internet Explorer.
More information about this security vulnerability, including a fix, is available from Microsoft: https://www.microsoft.com/technet/security/bulletin/MS04-025.mspx
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
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