binary data in a form field gets changed

I'm about to migrate a Coldfusion9 application running on SunOS to Coldfusion10 on Suse Linux.

The webpages work perfectly on the new installation.

However there is also kind of a system interface where clients post forms to a CF page where one of the form fields (intentionally) contains binary data mixed with plain text.

This worked perfectly on the old installation.

The formfield is taken out of the request using

<cfset requestContent="#form.fieldt#"/>

On the new installation this works for the plain text part, but the binary data is somehow changed.

Any idea how I can prevent Coldfusion from changing the binary data?

Thanks

Pedro