zliazmei,
1. Make a batch file (*.bat) which contains this text for example:
dir c:\sub\*.dwg/b >c:\sub\dirlist.txt
2. save it say on c:\sub\dirbat.bat
3. prepare RunApplication on macro with command line c:\sub\dirbat.bat
4. Run macro
5. Attach the text output dirlist.txt as linked table.
209larry