CMIS document browsing per folder

Hi all.

I recently started working on CMIS, and I have a requirement to allow the user to browse through a site for files.
Now I have been able to list the files of a single container (folder), however what I need is the ability to list all files within that Site that have a specific type.

I found this forum topic : https://forums.alfresco.com/forum/developer-discussions/alfresco-api/how-download-individual-files-alfresco-cmis-using-c-0 but is does not fully fulfill my need.

In the end this files will be listed in a dialog box for the user to select one.

You help is much appreciated.