I have been reading and find some people saying something about server extensions but I cant find those extensions for windows, they are just for unix-type OS. If someone could help me please!
try Notepad 
You'll be MUCH happier and it is more fullfilling know that you have done it solo.
Frontpage is "ok" for constructing layout and making pages look nice..., but the way it handles forms requires so much tie-in to the OS hooks via extensions...
Remember the caveat "K.I.S.S."
What are you trying to achieve?
can you provide the psuedo-code and can help you sift through how to set up the form by hand
Maybe he's trying to set this up for a customer? I would hate to try and sell your point to a customer with that kind of blase attitude.
Now, to try and answer the question... I know there are FP scripts that have to be setup with the site, but I don't know a whole lot more than that, might point you in the right direction though.
Stephen VanDyke
Well, my intent was not to be blase' at all, and I apologize if that came across...
And though I would never relate the same intimations to a client, I would point out to a client, that if they are requesting a Windows environment, and FrontPage Extensions, then the need for Apache is then obviated
IIS is already built in (if NT/win2k or xp) - any other win platform would not be suitable, and you are ready to just configure the IIS web server, tie in the extensions, and voila, ur up and running.
Php can then be setup via the Services/Management Console, if not present, goto Add/Remove Programs|Add/Remove Windows Components|Internet Information Services|Front Page Extensions, click add, and then supply the disc to the CD drive.
I "assumed" that what he was trying to do was setup for local testing, forgive me.
For local testing of PHP, he needn't have to worry about FP ext.'s if running Apache, because there is not that support for Apache on the Win Platform (AFAIK - though i could be wrong) but know that the extensions can be installed for use on the Unix platform via contributed distributions.
Sorry about that, hope that was more clear.
If however, Ricardo, you ARE wishing to use Apache + PHP (and are merely "using" the Win platform, as I do, for convenience) then, I believe my earlier statements hold true.
In that case, you needn't worry about the FP extensions, unless you are trying to replicate how the FP extensions would work through the Win OS, if so, then the IIS route would be much simpler
pardon me, I left out a step if configuring IIS for PHP, if that is the case, let me know and ill be more than happy to step you through that.
=)