solid object but able to shoot through it

[bsspewer]

well it's me again....this time i'm wondering why my object is solid yet u can shoot through it.  Followed all the tutorials but i don't understand y when i can't walk through it i can still shoot through it.  Does it have something to do with the other LOD's? like fire-geometry?

[SFG]

Add a geo lod convex it then add mass(ALT-M).

[bsspewer]

i have..no such luck..still can shoot through it

[SelectThis]

try adding a fire geo.

SelectThis

[bsspewer]

ok..tried adding that fire geo but it didn't seem to help..if anyone would like to take a look at it i can send them the .pbo or something.  If not does anyone else have an idea?

Edit:   In fact, here's the .p3d and textures and .cpp files :

http://www.geocities.com/socer6/mediumwall.zip
(right click and click 'save link as..' to get the file)

[bsspewer]

ok..that link has been removed cause i've solved the problem the best i could.  I tried both ways suggested to me but neither worked.  Since i had a window i couldn't just component convex hull it without oxygen making the window solid and unable to shoot through it.  So instead i had to divede the wall up into 4 components each completely surrounded with faces (so 6 faces each piece), the left side, right side, above window, and below window.  Then convex hull'd each component seperatly, added mass, and now it works so that the wall part is solid and inpenetrable and the window works like a window.  I wish there were simplier ways besides creating these extra faces that just get hidden next to another face of a differant box.