Ryujinx is an open-source emulator for the Nintendo Switch, and "ldn" likely refers to a specific version or build of the emulator, possibly focused on experimental or development features. The "313" could indicate a specific build or commit number.
: Navigate to the main directory where your Ryujinx.exe is located. Create a new folder there and name it exactly portable .
Since the main site is down, you must rely on third-party archives or community-maintained forks: