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I'm able to load static PHP files for my theme without any problems but do I name the file as file.php or file.inc? I found out that either way works fine so which one is better?
<?php include ".." . base_path() . path_to_theme() . "/includes_folder/file.php"; ?>
<?php include ".." . base_path() . path_to_theme() . "/includes_folder/file.inc"; ?>
Remember that the files are saved in my theme folder since I'm not making a module. It's just static content.
The extension ".php" is used for template files, whose extension is really ".tpl.php" files that are included from other files, such as module files, should use the ".inc" extension.
Drupal 8 uses .php (not ,tpl.php) for templates and PHP files containing classes, but still uses .inc for files loaded from modules, such as path.inc.
The Drupal 7 coding standards (#includes) seem to use ".inc" over ".php". If you browse the Drupal Core you see ".inc" is used everywhere. I suggest you stick to ".inc".
As others have answered I suggest you stick with the coding standards set out by Drupal.
Make sure to protect your files though: .inc files called directly from the browser may not be pre-process by php and therefore your source code will passed straight to the user. This may already be done for you by Drupal at a high level, or may not be required due to webserver configuration.
Lastly consider checking inside each of your .inc files that they are not the entry point, devious users might cause unexpected behaviour.
