The purpose of library_file is described in its controller:

"* The library file block is an internal block type used by external block types to reference files. Basically, any file in Concrete maps to an instance of the library file block.
"

You need this block type. I suggest not to delete any default block type. Why creating possible problems that nobody needs? Block types don't bother you. Why would you want to delete them?

block/templates/header_menu/view.php and block/templates/header_menu.php basically are the same thing. You can use the subfolder version if your template consists in more than one single file.

you are right cgrauer, library_file is must installed. thanks, for your reply.

but some of other block i think i don't need it, like google map(i change to premium google map), next & prev nav(in page list, there is already pagging), video player, tags(?), rss displayer(already use 3rd party), date nav(it's use jquery, i only need jquery in admin), and other etc block that i think i absolutly don't need it(and in the future too).

so,
why install block when you never used it?
why create table in database when you never insert a record?

i think it's just depend on the fitur what we need.

for include template, i dont used it anymore.
i used this one


someone side,
one for all, and one template for all :)

well, i play c5 litle by litle after work

thanks.

nb: dude, your big photo in your profile it's very cool :)