Have you ever browsed the implementation of FileStream and checked subclasses and friends? Well, I made a cleaner implementation at the side with - a simple File object that is a sequential File as we all know - a binary File stream on top of it that is composable with Zn encoders and other decorators - a new interface to access Stdio streams Stdio stdin. Stdio stdout. ... All that with tests and comments. https://pharo.fogbugz.com/f/cases/15486/Refactor-File-Package Now, the system still has tons of references to the following classes FileStream -> 127 StandardFileStream -> 24 MultiByteFileStream -> 9 Most of them should be easily replaceable. Others may require wrapping the binary file stream provided by a file with a Zn encoder or similar. So, if you have some minutes in your week and can replace 3, 4, 5 of them, we will be a little step closer to simplify file handling and dependencies :) Guille