Basically the idea to start this thread came from here ... https://forums.macrumors.com/threads/os9-late-osx-no-file-sharing-via-afp.2167422/ PS: Many thanks to all fellow MR-PPC-Forum members - without their genius help and advice things wouldn't have got so far by now --- I'd like to use FileSharing between old PPC-Macs with os9 and intel-Macs (mine currently running on ElCapitan). AFP on os9 only allows connections to OS X 10.1 - 10.5. Currently I use a workaround to connect os9 to a virtual LeopardServer-session on ElCapitan. Yesterday I found a very promising link about how replacing /System/Library/CoreServices/AppleFileServer.app in Yosemite by the same file from Leopard can reachieve AFP-connections between os9 and late OS X. http://www.applefool.com/se30/#leopardfileserver When I tried this on ElCapitan tonight, all came to an halt, when Finder refused to copy the Leopard-version of AppleFileServer.app into the named folder on ElCapitan. I wasn't even able to rename the file on ElCapitan. Could someone give me help, how to trick in ElCapitan to change stuff in the /System/Library/CoreServices/ - folder? Left side: ElCapitan-version; right side: Leopard-version (extracted from my PowerBook) Would I need a "pure" intel-version from a Leopard-installation on an Intel-Mac? Does anyone have an intel-Mac Leopard-installation to check, if that AppleFileServer.app file is also labeled as "i386 PPC" ?