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File Extension

HTA File Format

HTML executable file

HTA is a file extension for an HTML executable file format. HTA files are used with Internet Explorer 5 and up. HTA files use HTML syntax to create applications requiring only an additional header and the HTA extension to differentiate. Care should be taken with these files. HTA files are often used by viruses to update the system registry.

MIME type: application/hta

 

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Robert Vibert explains how a virus is executed from Outlook preview pane.

Tom Chmielarski explains 'Using Windows software restriction policies to stop executable code.'

This was last updated in August 2010
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There is a browser hijack that leads the user to download and run FlashPlayer.hta, purportedly a Flash Player update. I was unfamiliar with the .hta suffix. Thanks for the info.
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