Why is the Modpack.jar so sensitive?

[Fredned102]

The modpack.jar will not load if it is in any other state (such as being a folder labeled "modpack.jar"). The minecraft.jar is more flexible than the modpack.jar. Is this a glitch or on purpose?

EDIT: Even if I change the folder back into a jar file it still acts like it is vanilla

[Cheap Shot]

You may be high. Just lay on the floor.

[Fredned102]

You may be high. Just lay on the floor.

That may be true... I just still don't understand.