entity framework - How do I get to use Model1.foo instead of Model1.edmx, and invoke IModelConversionExtension callbacks -

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I use a VSIX and an associated MEF DLL according to the IModelConversionExtension class documentation, and as a pkgdef file .foo is an extension of the installation EF designer to invoke

  [PartCreationPolicy (CreationPolicy.Shared)] [export (typeof (IModelConversionExtension))] [ModelFileExtension ( "foo.")] public class MyConversionCallback:. IModelConversionExtension {Public Zero OnAfterFileLoaded (ModelConversionExtensionContext Reference) How does this get called? Return; } Public Zero OnBeforeFileSaved (ModelConversionExtensionContext Reference) {/ How is this called called? Return; }} [$ RootKey $ \ Editor \ {c99aea30-8e36-4515-b76f-496f5a48a6aa} \ Extensions] "foo" = DWORD: 00,000,032 [$ RootKey $ \ Projects] [$ RootKey $ \ projects \ {F184B08F-C81C-45F6 -A57F-5ABD9991F28F}] [$ RootKey $ \ projects \ {F184B08F-C81C-45F6-A57F-5ABD9991F28F} \ RelatedFiles] [$ RootKey $ \ projects \ {F184B08F-C81C-45F6-A57F-5ABD9991F28F} \ RelatedFiles \ .foo ] ".diagram" = DWORD: 00000002 [$ RootKey $ \ projects] [$ RootKey $ \ projects \ {FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}] [$ RootKey $ \ projects \ {FAE04EC0-301F-11D3-BF4B -00C04F79EFBC} \ RelatedFiles] [$ RootKey $ \ projects \ {FAE04EC0-301F-11D3-BF4B-00C04F79EFBC} \ RelatedFiles \ .foo] ".diagram" = DWORD: 00000002   
 I To work fine Antrn generation MEF classes can get both. And my Model1.foo calls EF Designer, but 1.Onfooted file loaded and on-bannerfile is never a fire, and 2.I get an error message when I try to save Model1.foo, which The error list asks for errors but none.  
  
 
 
 
  Onafferfail loaded  should be applied if you load the file whose extension  edmx vary from  and  IEntityDesignerConversionData.FileExtension  provides a value that your extension Matches  OnBeforeFileSaved  works in the opposite way - on saving. However - I saw the code in this area today and concluded that it can not really work, I filed a work item for it: