i need to set permission that user cannot delete the file but can change, modify, read and write. when i apply this permission on a folder in which have multipe files like word, excel and autocad drawing files. i try from client pc permission works for all files except autocad drawing files. i got message while saving " unable to save to drawing z:\abc.dwg as it is being access by another session. Drawing save to z:\savAF.temp" kindly help me to solve this problem