If I want to open an Editor on a file, I would have to do:
IFile iFile = myIFile;
PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage()
.openEditor(iFile, FormEditor.ID);
apart for the fact that IFile refers on a file inside the project, which makes sense inside eclipse, but perhaps not always in an RCP product basing on eclipse.
So to open an editor on an external (external == wherever in the filesystem != in the eclipse project) file, here is what is possible since 3.3:
File f = new File(path);
IPath ipath = new Path(f.getAbsolutePath());
IFileStore fileLocation = EFS.getLocalFileSystem().getStore(ipath);
FileStoreEditorInput fileStoreEditorInput = new FileStoreEditorInput(
fileLocation);
IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow()
.getActivePage();
page.openEditor(fileStoreEditorInput, FormEditor.ID);
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