A .rar file is a compressed archive. If you have downloaded this specific build, it usually contains the game's executable and asset folders. To play it, you would typically: using a program like WinRAR or 7-Zip.
If you are looking for a on how to beat this specific version or want to know the patch notes for this build, Runic.Survivor.Build.9864537.rar
: Combining different magical runes to create devastating area-of-effect attacks. Runic.Survivor.Build.9864537.rar
: Build numbers like 9864537 are often replaced quickly in the indie scene as developers squash bugs discovered by the community. Runic.Survivor.Build.9864537.rar