I made a .pak file using PakHelper v3.2 with makeobj v51 using two files (.dat and .png - both found bottom of this post). The .pak file was made, so I tested a bit. The building details appeared but the building image didn't.
I edited .dat on Notepad. The dat file goes like this:
#movietheater2.png
obj=building
name=Movie Theater
description=Lots of people love to watch movies! You should come.
copyright=stmaker
intro_month=1
intro_year=2001
type=com
chance=100
level=10
Help me. I placed both of the files on the bottom of the post. (and one request - someone make me that one to .pak file

)
EDIT: Solved. Thanks whoever helped me.