I recently found a copy of a Minecraft Alpha 1.2.6 server JAR. I'm using the .bat startup method, but when I run as administrator, the console window spits out something like "Cannot access jarfile minecraft_server.jar" even though they're in the same folder and properly named. Same thing happens when I try to generate a server from a Beta 1.7.2 JAR.
Is there a different way of doing this? I never got into making servers until 2012.