Unsure of any existing B3d-written code, but doesn't MoleBox do the sort of thing you're asking for?
(it's a commercial (aka, $) packer program which uses a DLL, and it can load encrypted files without needing to write them to disk...might be what yer looking for)
(it's a commercial (aka, $) packer program which uses a DLL, and it can load encrypted files without needing to write them to disk...might be what yer looking for)