Ok I need some help in installing and reading these so call font files that I've been seeing a lot. I use Windows XP and when I try to install these kind of front files on my pc, it say it's not a proper font file and can't be installed.

These font files always look like something like this:

._Book Antiqua and Book Antiqua

The ._Book Antiqua is the one with a file size of 269kb while the Book Antiqua is just an empty 0 file size.

All the other fonts are like that too. It has the name of the font but start with a ._(name of font) and an empty file size with the name of the font.

What program uses these kind of font files?

How are you trying to install them?

It has the name of the font but start with a ._(name of font) and an empty file size with the name of the font.

What program uses these kind of font files?

I believe they would be fonts intended for a MAC computer.

It would appear that you have used a PC computer to 'unzip' a MAC archive containing old fonts used on a MacIntosh system.

You should be able to locate a TTF version online, or better yet, an OTF version which can also work on the Intel based MAC.

Do they have no file extension?

No they don't file extension hence the mystery of what type of fonts these are and what kind of programs or pc.