How can I tell if a RTF-lite field contains a PDF file?

I have multiple RTF-lite fields witth various names in Notes documents. I need to put icons in a view to show if these fields contain PDF files loaded to or not.
Previously, I loaded a single PDF to a standard RTF 'body' field, and used @attachments function to determine this, but with the multiple RTF-lite fields this does not seem to work.
My first idea was to test the @length of the RTF-lite field, but I can not get thet to work either.
trnieAsked:
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daj_ukConnect With a Mentor Commented:
@AttachmentNames returns that names of any attachments to the document, including those on an RTLite filed.  Using this you could work out if it is a PDF and show an appropriate icon on the view column....

In my example, I created a Column with the following formula

@If(@Contains(@UpperCase(@AttachmentNames) ;".PDF");5;0)
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