CMIS Connectors Document Format Issue

Hi All,

we could able to do the Atom Binding with the CMIS system and we are able to push the documents from Appian to Documentum(CMIS)

and we could able to get the file from Documentum to Appian..--

However we are facing one issue 

Lets say we have a doc ABC.pdf in Documentum.

when pushing the document it is coming as a Media File like ABC.file

now when i download it and change the type it is working absolutely fine.

Now how can i achieve this with .pdf extension with CMIS Connectors itself.....

Please suggest

TIA :)

Harsha