Linux version IDE and Window Verion IDE acting differently

On linux 1.7.8 and window 1.6.8

I have a project file .Zip containing all the .ino files.

Under linux IDE, I do sketch--> import library---> add library and then I choose project.zip

and then I can see the project under File-->Sketch--->library.

Imported project successfully.

But under window 1.6.8
Sketch-->include library---->add .zip library I choose project.zip

but there's an error message saying the project.zip doesn't contain valid library files.

imported project unsuccessfully

Why the differences?

Delta_G:
The version numbers you mean Arduino IDE versions? 1.7.8 comes from Arduino.org not Arduino.cc. It's not an official version. It comes from different people.

So, How do you import a project.zip file into IDE under window?

Right now, its complaining there's no valid library file if I choose Add .zip library option.

lilzz:
So, How do you import a project.zip file into IDE under window?

Right now, its complaining there's no valid library file if I choose Add .zip library option.

Perhaps the person didn't construct the library ZIP file properly. Then you install the library manually. There are instructions on how to do that if you choose to read them.