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CSS Mime Type Failure

I am getting the following error when loading an Infragistics style bundle on our deployed test server.

Refused to apply style from ' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.

Bundle Config:

// Infragistics CSS
bundles.Add(new StyleBundle("~/Content/infragistics").Include(

Use in Page:


The paths are correct, we are using a local NuGet package to load the css into the project.

Any help would be appreciated.