win server 2003

my external hard disk is not showing any data files of sap when connected to server 03 (it showing empty). but when connected to xp optg system it is showing 52 gb used out of 110 gb and also showing ora data files in that. how to view e:\oracle\ora81\BIN\TNSLSNR this file is missing (when verified in event viewer) one of my frind told me. if this file will be activated then i can operate external harddisk. if it is not clear pls let me know