Issue #13831 has been updated by joshc (Josh C). We've been carrying a patch for this issue for many years now and I submitted a PR: https://github.com/ruby/ruby/pull/7366 It affects ruby 3.2.1 through 1.9.3. ---------------------------------------- Bug #13831: error when try to install https://bugs.ruby-lang.org/issues/13831#change-102011 * Author: khaledal (khaled alajmi) * Status: Third Party's Issue * Priority: Normal * ruby -v: ruby 2.4.1p111 (2017-03-22 revision 58053) [x64-mingw32] * Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN ---------------------------------------- ruby 2.4.1p111 (2017-03-22 revision 58053) [x64-mingw32] C:\Users\K>gem install sass C:/Ruby24-x64/lib/ruby/2.4.0/win32/registry.rb:72:in `find': unknown encoding name - CP720 (ArgumentError) from C:/Ruby24-x64/lib/ruby/2.4.0/win32/registry.rb:72:in `<module:Win32>' from C:/Ruby24-x64/lib/ruby/2.4.0/win32/registry.rb:4:in `<top (required)>' from C:/Ruby24-x64/lib/ruby/site_ruby/2.4.0/ruby_installer/runtime/msys2_installation.rb:46:in `require' from C:/Ruby24-x64/lib/ruby/site_ruby/2.4.0/ruby_installer/runtime/msys2_installation.rb:46:in `iterate_msys_paths' from C:/Ruby24-x64/lib/ruby/site_ruby/2.4.0/ruby_installer/runtime/msys2_installation.rb:69:in `msys_path' from C:/Ruby24-x64/lib/ruby/site_ruby/2.4.0/ruby_installer/runtime/msys2_installation.rb:82:in `mingw_bin_path' from C:/Ruby24-x64/lib/ruby/site_ruby/2.4.0/ruby_installer/runtime/msys2_installation.rb:92:in `enable_dll_search_paths' from C:/Ruby24-x64/lib/ruby/site_ruby/2.4.0/ruby_installer/runtime/singleton.rb:27:in `enable_dll_search_paths' from C:/Ruby24-x64/lib/ruby/2.4.0/rubygems/defaults/operating_system.rb:3:in `<top (required)>' from C:/Ruby24-x64/lib/ruby/2.4.0/rubygems.rb:1345:in `require' from C:/Ruby24-x64/lib/ruby/2.4.0/rubygems.rb:1345:in `<top (required)>' from <internal:gem_prelude>:4:in `require' from <internal:gem_prelude>:4:in `<internal:gem_prelude>' C:\Users\K> -- https://bugs.ruby-lang.org/