Added check to BaseImporter::SearchFileHeaderForToken making sure that a detected token is not in fact just a fraction of a longer token. Microsoft exported binary gltf files were detected as OBJ, because the "gltf " in the string "Microsoft GLTF Exporter 2.4.1.7" was detected as the token "f ". I added a new bool parameter to the method enabling this check. It's default false, and only ObjFileImporter sets it to true, so no other code should be affected.

code/ObjFileImporter.cpp

@@ -100,7 +100,7 @@ bool ObjFileImporter::CanRead( const std::string& pFile, IOSystem*  pIOHandler ,
     } else {
         // Check file Header
         static const char *pTokens[] = { "mtllib", "usemtl", "v ", "vt ", "vn ", "o ", "g ", "s ", "f " };
-        return BaseImporter::SearchFileHeaderForToken(pIOHandler, pFile, pTokens, 9 );
+        return BaseImporter::SearchFileHeaderForToken(pIOHandler, pFile, pTokens, 9, 200, false, true );
     }
 }