User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.7) Gecko/20060922 Firefox/1.5.0.7
Build Identifier: 

when you select multiple files or folders and you open the context menu, you can create a new archive from those files. but if the first selected item is an archive, then no new archive is created but instead all the other content is just added to this first archive.

Reproducible: Always

Steps to Reproduce:
1.select 2 archive files
2.open the context menu
3.chose create archive

Actual Results:  
the 2nd file is added to the first archive

Expected Results:  
the "new archive" dialog pops up which lets you create a new archive _or_ just not show the "create archive" menuitem since i don't think xarchiver can handle this case on its own.