hercules22 0 Newbie Poster

hi all plz read below carefully
All pc are connected in lan where one is win server wher i am sharing a file to give permission to a perticular user, structure is as follows
1)a)created one folder with name "test".b)shared with full permission for 10 user
c)under security tab clicked on advanced & unchecked allow inheritance.& added all the 10 users.

2)a)created another subfolder 'time' in "test".
b)under security again i followed step1 c but only with 5 users

3)finally i created one excel sheet in 'time' folder.b)under security in advanced i unchecked allow inheritance & given full permission to only user1.
now the problem i m facing is whenver user1 open that file frm his pc, edit & save. that time i checked security of that excel file on the server & it was showing full permission to all 5 users. please give me solution to avoid this file from access to all remaining users.

Thank You