Windows environment failed to include files
Permalinkfor instance:
$this->inc('elements/header.php');
Got Error:
Seems that the direcotry separator is not well set for windows enviroment, is there any way to solve this issue?
Thx

concrete/themes/edes
Doesn't it have to look into application/themes/edes? I assume you're running concrete5 5.7 btw. Otherwise it's themes/edes (there is no application folder in 5.6).
Where are you putting this code exactly?
C:\xampp\htdocs\edes\application\themes\edes\full.php
anyway I've solved this using:
require('elements/header.php')
Now its loading files just fine
C:\xampp\htdocs\concrete/themes/edes/elements/header.php
With
C:\xampp\htdocs\edes\application\themes\edes\full.php
You will see the "edes" is missing in the first one (that's the path that gave you the error). So for some reason, your installation thinks your root website is located under "C:\xampp\htdocs", which it is not. So if you can fix that, you don't have to require or include the file, but use $this->inc() instead like you should.