Help with inaccessible embedded resource issue

There are two programs that are very similar in code for the same purpose, and one of their functions is launching a winform.

The main difference betw开发者_StackOverflow社区een them is that one is 'targetted' to .NET 3.5 (and so uses 3.5 methods/conventions) and the other is a .NET 4.0 project (does same thing with newer methods)

the 3.5 project can launch the winform fine, but the 4.0 project reports that the icon '$this.Icon' embedded within the form's .resx file cannot be found.

Is there a key difference between 3.5 and 4.0 that could be causing this? Maybe 4.0 is stricter about naming conventions and doesn't like the dollar sign?

I've imported the code file that calls the form from 3.5 to my 4.0 project and that still throws a file not found error :(

error message : Could not load file or assembly 'Olympic.Braindump.OutlookPlugin2010.resources, Version=1.0.0.0, Culture=en-US, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.

part of the stacktrace : at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) at System.Reflection.RuntimeAssembly.InternalGetSatelliteAssembly(String name, CultureInfo culture, Version version, Boolean throwOnFileNotFound, StackCrawlMark& stackMark) at System.Resources.ManifestBasedResourceGroveler.GetSatelliteAssembly(CultureInfo lookForCulture, StackCrawlMark& stackMark) at System.Resources.ManifestBasedResourceGroveler.GrovelForResourceSet(CultureInfo culture, Dictionary2 localResourceSets, Boolean tryParents, Boolean createIfNotExists, StackCrawlMark& stackMark)