APC & Custom streams

Hi Does APC support caching PHP files which are included/required from non-file urls? e.g., if i define a custom url scheme, e.g. module://utils/main.inc, will APC cache includes/requires of such urls? My need: I have a complex application composed of several modules, each of which contains dozens (or even hundreds) of PHP & other files. I decided I'd try putting each of these modules in a zip, and writing a custom stream which reads a file from the zip. Now, I knew this would slow done each page load a lot, esp. given the large number of PHP files included in every page. But I thought to myself -- I'm using APC, after loading it the first time, it should just get cached. But my apc_cache_info doesn't mention any of the files included via the custom url scheme. Did I do something wrong with writing my scheme implementation? Or does APC not support this? If APC doesn't support this, do the APC developers have any plans to add it? Would it be hard to add myself? Thanks Simon