Option saving error with windows while network activated

When network activate on windows, when I try to save I get a file not found error because it tried to save to wp-admin/network/options.php.

in common.php–

if (function_exists('is_plugin_active_for_network') && is_plugin_active_for_network(EWWW_IMAGE_OPTIMIZER_PLUGIN_FILE_REL)) {
				$output[] = "<form method='post' action=''>\n";
			} else {
				$output[] = "<form method='post' action='options.php'>\n";
			}

is_plugin_active_for_network(EWWW_IMAGE_OPTIMIZER_PLUGIN_FILE_REL) was returning false. Due to–

if ( strtoupper( substr( PHP_OS, 0, 3 ) ) == 'WIN' ) {
	// this is the path of the plugin file relative to the plugins\ folder
	define('EWWW_IMAGE_OPTIMIZER_PLUGIN_FILE_REL', 'ewww-image-optimizer\ewww-image-optimizer.php');
	// the folder where we install optimization tools
	define('EWWW_IMAGE_OPTIMIZER_TOOL_PATH', WP_CONTENT_DIR . '\ewww\\');
} else {
	// this is the path of the plugin file relative to the plugins/ folder
	define('EWWW_IMAGE_OPTIMIZER_PLUGIN_FILE_REL', 'ewww-image-optimizer/ewww-image-optimizer.php');
	// the folder where we install optimization tools
	define('EWWW_IMAGE_OPTIMIZER_TOOL_PATH', WP_CONTENT_DIR . '/ewww/');
}

in ewww-image-optimizer.php. Not sure if it’s because you aren’t escaping all the backslashes or what. I don’t think \e means anything, but regardless, PHP treats / and \ the same on windows so there is no need to differentiate. If I change the above code to:

// this is the path of the plugin file relative to the plugins/ folder
define('EWWW_IMAGE_OPTIMIZER_PLUGIN_FILE_REL', 'ewww-image-optimizer/ewww-image-optimizer.php');
// the folder where we install optimization tools
define('EWWW_IMAGE_OPTIMIZER_TOOL_PATH', WP_CONTENT_DIR . '/ewww/');

(removing the windows conditional) then the options saves correctly.

Reference: http://php.net/manual/en/function.basename.php

On Windows, both slash (/) and backslash (\) are used as directory separator character. In other environments, it is the forward slash (/).

https://wordpress.org/plugins/ewww-image-optimizer/