Excel VBA Paste of Range with PrefixCharacter fails from VB.NET dll

[Nicholas Dreyer]

Operating System: Microsoft Windows Version 5.1 (Build
2600.xpsp_sp2_gdr.050301-1519 : Service Pack 2)

Visual Basic: MIcrosoft Visual Basic 6.3 Version 9972 VBA: Retail
6.4.9972 Forms3: 11.0.6550 (comes with Excel 2003)

The copy paste code below fails to copy the PrefixCharacter from cell
"a1" to cell "a2" when compiled into a dll and called from VBA, yet
running from a VB.NET main program the PrefixCharacter is copied, as
it is when done in a pure VBA module.
_______________________________________________
With Microsoft.Office.Interop.Excel.Application.Actives heet
.Range("a1").Copy()
.Range("a2").PasteSpecial(Paste:=xlFormulas)
.Range("a2").PasteSpecial(Paste:=xlFormats)
End WIth
The following library references are used in the VB.NET project:

Assembly Microsoft.Office.Interop.Excel
C:\WINDOWS\assembly\GAC\Microsoft.Office.Interop.E xcel\
11.0.0.0__71e9bce111e9429c\Microsoft.Office.Intero p.Excel.dll

Assembly office
C:\WINDOWS\assembly\GAC\Office\11.0.0.0__71e9bce11 1e9429c\
Office.dll

Assembly Microsoft.VisualBasic.Compatibility
C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\
Microsoft.VisualBasic.Compatibility.dll

Assembly System
C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\
System.dll

Assembly System.Data
C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\
System.Data.dll

Assembly System.Windows.Forms
C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\
System.Windows.Forms.dll

Assembly Interop.VBA
C:\vb\Nick\PlanningToolsModules\bin\
Interop.VBA.dll

Assembly Microsoft.Vbe.Interop

C:\WINDOWS\assembly\GAC\Microsoft.Vbe.Interop\11.0 .0.0__71e9bce111e9429c\
Microsoft.Vbe.Interop.dll

and the following "Imports" statements are included:
Imports Microsoft.Office.Interop.Excel
Imports Microsoft.Office.Interop.Excel.Constants
Imports Microsoft.Office.Interop.Excel.XlLookAt
Imports Microsoft.Office.Interop.Excel.XlSearchOrder
Imports Microsoft.Office.Interop.Excel.XlFindLookIn
Imports Microsoft.Office.Interop.Excel.XlDirection
Imports Microsoft.Office.Interop.Excel.XlAxisType
Imports Microsoft.Vbe.Interop
Imports Microsoft.Vbe.Interop.vbext_ComponentType
Thanks for any clues! Nick