Resource files falsely enumerated as part of project

Question

We have a localized WinForms application.
When we get translations from 3rd party, new *.<language>.resx files appear in the project folders and need to be added to the projects.
For common resource files, e.g. Properties\Resources.de.resx, nothing changes when new files are present, but for the WinForms controls the new files, e.g. AboutBox.de.resx, appear in the solution explorer with a gray dotted icon, even if "Show All
Files" is not checked.
To add these new files to the project we use a Visual Studio Extension; it's using EnvDTE model to enumerate all EnvDTE.ProjectItem of all projects, and checks if additional resource files are in the folder but not yet in the project.
Now for the WinForms resources the new files are already enumerated as part of the project (like they are shown in solution explorer) and we can't find a way to distinguish if the item is a real project member or a fake one.
Is there a way to switch of the "feature" of enumerating fake project items for WinForms resources, or any other means to detect these fake items and add them as real items?

Answer 1

This is a screen shot of the Solution Explorer:
AboutForm.zh-CN.resx is in the folder and it's enumerated as a ProjectItem, but when you build, there is no Chinese translation.
Hello,
To confirm whether it has been added to that project, we could open the projectName.cropj file, and check whether there is the line for that file.
<EmbeddedResource Include="Form1.af.resx">
<DependentUpon>Form1.cs</DependentUpon>
</EmbeddedResource>
If not, then we could consider adding that item with MSBuild like this thread below.
How to dynamically add Embedded Resources
to a VS 2010 csproj - Project before compilation?
And if you get any concern about MSBuild, you could post them in
Visual Studio Development >
MSBuild  forum.
Regards,
Carl
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