error LGHT0132: The assembly file 'somedll.dll' appears to be invalid. Please ensure this is a valid assembly file and that the user has the appropriate access rights to this file.

When we try to build a wix project that refers an C++ dll, we may face below error

error LGHT0132: The assembly file 'somedll.dll' appears to be invalid.  Please ensure this is a valid assembly file and that the user has the appropriate access rights to this file.

It is strange cos it happens only in few machines. Following below steps might resolve the error

1. Open your *.wixproj file for editing.
2. Add <SuppressAssemblies>True<SuppressAssemblies> under a 'PropertyGroup' that has relevant 'Light' settings.


example:

  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
    <OutputPath>bin\$(Configuration)\</OutputPath>
    <IntermediateOutputPath>obj\$(Configuration)\</IntermediateOutputPath>
    <WixVariables>BannerBitmap=..\..\Branding\TrustDigital\Installer\topimage.bmp;WixUILicenseRtf=..\..\Branding\TrustDigital\Installer\terms-of-use.rtf;WixUIDialogBmp=..\..\Branding\TrustDigital\Installer\leftsideimage.bmp</WixVariables>
  </PropertyGroup>





   I identified above as my relevant PropertyGroup becauase it contains 'WixVariables'(LIGHT related task), so i just need to insert <SuppressAssemblies>True<SuppressAssemblies> into this PropertyGroup.