How To Run SSE Under User Permissions?

Hello,
Our application works this way: attaches database, modifies data and dettaches database. This works fine when user has administrative permissions, but does not work for users with standard permissions. The reason is that SSE ovewrites MDF file permissions (after MDF is attached) and then it is accessible only for Administrators, Network Service and SQLServer2005MSSQLUserxxxxx. How to avoid this behaviour? We want to keep permissions of MDF file as they are, i.e. inherited from parent folder. This becomes serious problem because some users are migrating to Vista where standard permissions are default (but the problem exists also on XP). Has SSE been designed to work in such environment?

Thank you in advance
Roman

P.S. We work with SSE SP2, BUILTIN/Users have sysadmin priviliges, problem is with file permissions of MDF. This behaviour can be easily reproduced with Management Studio - just attach MDF file and look how permissions were changed.