One of my users is getting a consistent C5 error when trying to read the clipboard as HTML (having been pasted there from Excel)

The code I am using looks like this:

Procedure ReadClipboardasHTML

	Local lcString, lcCF, lnH, lnLen, lxPtr

	Declare Long GlobalLock In Win32API Long Hmem
	Declare Long GlobalUnlock In Win32API Long Hmem
	Declare Long GlobalSize In Win32API Long Hmem
	Declare String lstrcpy In Win32API String @ lpDest, Long lpSrc
	Declare Long OpenClipboard In Win32API Long
	Declare Long CloseClipboard In Win32API
	Declare Long RegisterClipboardFormat In Win32API String
	Declare Long GetClipboardData In Win32API Long uFormat

	lcString = ""
	*  lcCF = RegisterClipboardFormat ("Rich Text Format")
	lcCF = RegisterClipboardFormat ("HTML Format")
	If (OpenClipboard (0) != 0)
		lnH = GetClipboardData (lcCF)
		If lnH > 0
			lnLen = GlobalSize (lnH)
			lcString = Replicate (Chr (0), lnLen)
			lxPtr = GlobalLock (lnH)
			lstrcpy (@lcString, lxPtr)
			lcString = Left (lcString, lnLen-1)
			GlobalUnlock (lnH)
		Endif
		CloseClipboard ()
	Endif

	Return Substr (lcString, At ("<", lcString))

Endproc

Any ideas or suggestions?

Thanks in advance,