Using ZC v1.5.3 and adding a plugin/mod (Edit Orders v4.1.4)

While comparing the plugin/mod version for the file admin/includes/init_includes/init_currencies.php with the default version in v1.5.3, I noticed the following:

ZC v1.5.3 original/untouched has the line:

require(DIR_FS_CATALOG . DIR_WS_CLASSES . 'class.currencies.php');
Yet the (original v1.5.3) folder/directory under admin/includes/classes has only the following file(name):

currencies.php

and not one named: class.currencies.php

That being the case, is there a problem here?

What does it need to be, to be accurate and not throw an error or warning?

That is:

require(DIR_FS_CATALOG . DIR_WS_CLASSES . 'class.currencies.php');

or this:

require(DIR_FS_CATALOG . DIR_WS_CLASSES . 'currencies.php');

Thanks in advance for clarifying...