I've been through IStorage, Microsoft Compound File Spec, ArcObjects deserialization etc. trying to detect the .lyr file version.
Using ArcObjects, I can get at the Layer properties, data source, extent, etc, but the documentVersion property of the LayerFileClass always reports back 'esriArcGISVersion10' on 9.3 Layer files.
ILayerFile l = new LayerFileClass(); l.Open(fileName); LayerFileClass t = (LayerFileClass)l; string version = t.DocumentVersion.ToString();
Any help is appreciated.
Note this crusty forum post from 2007.