On Windows, the php built-in webserver may stiggle with paths that have dot in the folder name (interprets the dot for file extensions). As a consequence, in some scenarios when linking to a resource with a dot in the folder name, you get a resource not found error even before the index.php is reached. The happens for example of a plugin has multiple dots in its folder name.

I worked around this for themes by renaming the folders, but the better way to do this is add a 'router.php' specifically for local dev and/or using built-in php server.

attached image is chatgpt's suggestion on how to implement