How to do a password screen to pop up when user accessing a protected folder or file?

Does anybody knows how can I implement popup of password screen when user
accessing a protected folder or file? Then, if password is OK, access
granted and processing of request continues as usual, otherwise, return
ERROR_ACCESS_DENIED to user.

Thanks!

Valery A. Boronin,
System Software Engineer, Novosoft
Web: http://www.novosoft-us.com
Email: xxxxx@novosoft.ru


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