These files are not an official product of Gravity and are often maintained by the private server community. Always scan files with anti-virus software before running them.

Using tools like WinRAR or 7-Zip, extract the contents into your Ragnarok Online folder.

Execute the kROsakexe...[Xray].exe file to launch the game.

They allow players to connect to servers that utilize older, specific packet versions that modern, updated clients cannot.

These files are usually found in rAthena client support sections.

If you're asking about a different kind of "Xray.rar" (such as a specific Minecraft Xray mod or a network tool), let me know! Connecting · rathena/rathena Wiki - GitHub

Many private servers aim to replicate the "pre-renewal" era of Ragnarok Online (around 2005-2007). These specific kRO clients are stable and compatible with that era's mechanics.

"Xray" usually refers to a specialized, often older, Korean Ragnarok Online (kRO) client executable (.exe) that has been pre-configured or "hexed" to work with private servers. These clients are often labeled with dates (e.g., 2007 - kROsakexe0423aN[Xray].rar ). The accompanying .rar archive typically includes: