Certain static objects not showing up in level editor

[SCP 1992]

I am trying to make a CS, but I've already run into a snag, a bunch of static objects aren't showing in level editor. The only thing I was able to tell about this problem was only files with a .dae extension would show up, while a lot of the others had .dds which didn't show up. Is there any way to fix this?

[jens]

Only .dae files are meant to show up, so is as it should be.