PIA installed, but can't find the OWC.dll(version 1.1)

hi guys,

Primary Interop Assembly are installed, but it does not work,my project can not find this refference at all.

message like this"Error 2 The type or namespace name 'Office' does not exist in the namespace 'Microsoft' (are

you missing an assembly reference?)

C:\eCART\Trunk\APP\WebService\Model.cs 7 25 ECART"

but ,if i unload porject and edit the project file to change owc.dll version 1.0 to 1.1, it works.

//***************org code****************

    <COMReference Include="OWC11">
      <Guid>{0002E558-0000-0000-C000-000000000046}</Guid>
      <VersionMajor>1</VersionMajor>
      <VersionMinor>1</VersionMinor>
      <Lcid>0</Lcid>
      <WrapperTool>primary</WrapperTool>
      <Isolated>False</Isolated>
    </COMReference>

// ********change to ************** 

    <COMReference Include="OWC11">
      <Guid>{0002E558-0000-0000-C000-000000000046}</Guid>
      <VersionMajor>1</VersionMajor>
      <VersionMinor>0</VersionMinor>
      <Lcid>0</Lcid>
      <WrapperTool>primary</WrapperTool>
      <Isolated>False</Isolated>
    </COMReference>

then reload project, i works, no error here.

(i dont have right to post pics...)

how could i make the refference right with owc.dll version

1.1, and what happend to me??

working envirment :

vs2005 sp1,

os:winxp sp3