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It´s a system account for Microsoft´s .NET technology.

The ASP.NET Machine Account is a limited-rights user account that ASP.NET server-side applications run under, in an effort to minimize the security threat created by using server-side processing.

The aspnet_wp or ASP.NET Machine Account is created when the Microsoft .Net Framework 1.1 is installed.

You can remove this account, but it is vital if you do ASP.net development work on your machine.

By removing the account you may find your ASP.net projects will no longer function correctly.