Server Problem

[Fyrex]

I was just trying to install this on my fresh minecraft server (http://minecraft.net/download) and tried to install the forge (minecraftforge-universal-1.4.5-6.4.0.397) into it  using winrar , but when I tried to delete the meta-inf in the server (by opening it with winrar) it said the Minecraft_Server was corrupt and it would not delete the meta-inf. I tried putting it in even though the meta-inf was still in there but it still said the same thing. I tried using the .jar version of the minecraft server but it came up as a winrar file and I don't know how to change it (I tried putting  .jar at the end of it)  . I really don't know what to do or how to install it on with the corrupt.

[Fyrex]

sorry no error code for this and tried to look it up on here and I couln't find a person with this problem and tried to google it  :'(

[keepcalm]

If you're on 1.4 or above, then you can just rename minecraftforge.zip to minecraftforge.jar and run that in the same folder as minecraft_server.jar, no winrar