Re-importing Configuration Objects

experts!

I have imported Configuration Objects from .tpz files in Integration Directory. Because of those objects where unable to activate, I did a reject change and all objects were gone. When I try re-import from the same .tpz file, it is not showing in the file list. The .tpz file is there in the import folder of directory.

Please help me to re-import objects from .tpz file.

thanks

nikhil