You will have to write server-side code using Request. BinaryRead to read the contents of the http request, after which you will have to parse through this information and manually extract the desired field values. Refer to RFC 1341 and RFC 1867 for details of the format of the request sent to the server. An easier way to retrieve the submitted file is by using a pre-built component, of which there are many. If you are on a Windows platform, DevGuru's dgFileUpload component will perform this task.
Support seems consistent across later browsers, however.
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