Select Part in File Browser

Hello, 

I am developing a macro to automatically insert a part in to new created part. The idea to use the file browser to select the desired solidwork part and then insert that part into the new created part.

i have developed the user form to open the window file browser but only allows my to select folder but not to select any format of file.

Could you please help me ? thanks in advance

Please find attached my code: 

Let me know anything you may need,

Thanks

SolidworksApi/macros