Benglin/Dynamo — pull request #217 by marimano (2014-11-20 15:44:19+00:00)
Title: Opening a file issue

It's possible a user tries to upload a file with `.dyn` or `.dyf` extension but it doesn't correspond to its content (a file with `dyn` extension but actually it's a custom node and v.v.). Therefore we can't relay on the file path when define the type. So define the type of workspace from the file content