Hello Felipe.
You will find the settings for this (along with most other important configuration options) in a file called httpd.conf or httpd.conf in a directory like C:\Program Files\Apache Group\Apache\conf. (If httpd.conf does not exist in such a folder, check for httpd.conf-dist-win or just httpd.conf-dist and rename that file to http.conf.)
Open this file in Notepad or your favorite text editor and find the line that says something like 'DocumentRoot "@@ServerRoot@@/htdocs". In my httpd.conf it's on line 279 and preceded with the following comments:
#
DocumentRoot: The directory out of which you will serve your
documents. By default, all requests are taken from this directory, but
symbolic links and aliases may be used to point to other locations.
#
All you need to do is change the value inside the quotes after DocumentRoot and save the file to have Apache pull your documents from that folder. Given the example you used, your httpd.conf should look like this on that line:
DocumentRoot "c:\mypages"
You may have to restart the server to see the changes, but that ought to do it for you!
Good luck!
Travis
