Question about project tree

Hi,

For many LaTeX projects I use the \input command to retrieve files from 
various directories. If the path information appears explicitly in the 
\input command (for example \input{path/filename}), this appears 
correctly in the project tree as "path/filename" (without quotes) and 
clicking on it opens the corresponding input file. However, if the path 
information is stored in a LaTeX variable (say, \mypath), then 
\input{\mypath/filename} produces "? filename" and clicking on it will 
result in a 'file not found' error message.

My question, therefore, is there a way of transmitting the path 
information in \mypath to the project tree macro? I presume this would 
have to involve retrieving this information from some file header which 
would be okay. (And if it should be possible, I would like the project 
tree to show only "filename" and suppress the path information.) I am 
perfectly willing doing some programming myself if I get pointed to the 
right files to get started.

Thank you.
--hh

PS: I use WinEdt build: 20071003  (v. 5.5).