Although my earlier post mentions this clearly, I wish to again emphasize the fact that you are not forced to use OS 8.1 to accomplish networking between an old 68k Mac and your modern OS X Mac. You can use System 7.5.5. You simply need to replace some networking components of System 7.5.5 with newer versions as described in my other post in this thread. And those newer versions happen to come with OS 8.1.
Why do I say this? Because some among us have SE/30's without any IIfx or IIsi ROM. That means those folks can only run up to System 7.5.5. Without the IIfx or IIsi ROM you will not be able to install OS 8.1 in the normal way to conveniently access the required files, but perhaps TomeViewer would work on the OS 8.1 installer? (I've not tried it.) Even so, I do have copies of the individual files myself, as I am sure other members here do.
Why do I say this? Because some among us have SE/30's without any IIfx or IIsi ROM. That means those folks can only run up to System 7.5.5. Without the IIfx or IIsi ROM you will not be able to install OS 8.1 in the normal way to conveniently access the required files, but perhaps TomeViewer would work on the OS 8.1 installer? (I've not tried it.) Even so, I do have copies of the individual files myself, as I am sure other members here do.