Manual backup of files fails

[Michal Glebowski]

Dear Friends.

I've got problem with manual backup of merge table.

1. I create MERGE table which consists of some MyISAM tables.
2. I copy database folder from my MySQL..\Data\ somewhere else.
3. I DROP DATABASE.
4. I manually copy back folder to MySQL..\Data\ folder
5. All partial tables are here back but when I try to access MERGE TABLE I get an error: Can't find file 'here my merge table name'.

I found that file responsible for keeping table structure (mymergetable.frm) is there.
What shall I copy more to be able to restore MERGE TABLE that way (manually)?
Michal.