A font shouldn't be in an .exe file. That sounds more like a virus, trojan or scam.

Most fonts are true type fonts, so they end with .ttf
I'd check what you downloaded.

If you are developing your own themes for concrete5, you'll need to research about using web-fonts and linking them in (you can't just use a TTF on the web). Have a look athttp://www.fontsquirrel.com or something like Google Web Fonts

If you are using pre-built themes, perhaps check out the various add-ons that will automatically link in fonts for you:
http://www.concrete5.org/marketplace/addons/-/view/?submit_search=1...

Here is a How-to that I wrote that you might find useful:

http://www.concrete5.org/documentation/how-tos/designers/how-to-add...

Also, I have some free themes in the marketplace that include their own fonts, so you could try those to see how its done.

thanks for your replay. that link you sent to me it sound easy to install but some information it is not clear like:
Upload all contents of your extracted font-face kit folder - EXCEPT the html file.

Re-name the included stylesheet to "fonts.css"
and:
From here, you can now apply the font name to any item in your regular theme stylesheet. Doing this is as simple as this:

h1.logo { font-family: 'Custom Font-Face', arial, sans-serif; }

i could not find the stylesheet? if you tried this method can you tell me a bite about this

Regards