Please describe the problem:
If on my computer "rom-desktop" I select for example 5 folders, then right-click, compress (tar.gz or any other format), it works.

Now, from the computer "rom-laptop", in nautilus, I access "rom-desktop" using sftp://rom-desktop, and I go to the same folder, I select the 5 same folders, then right-click, and compress.

In that case, it copies the content in ~/.cache/.fr-... During this operation, it crashes : http://pix.toile-libre.org/upload/original/1247773830.png
In english : "Error while opening file : /home/rom/.cache/.fr-r5ZQvG/sqldumps/wordpress_20090706-232002.sql.gz is a folder"

This is not a problem with that particular file (which is a file on "rom-desktop", but indeed a folder in .cache) : if I choose any other folder to compress this way, I have exactly the same problem with another file.

Steps to reproduce:
1. ssh mount a folder in nautilus (a folder with many directories / files)
2. right-click and compress a folder
3. 


Actual results:
It crashes, somes files are copies as directories in ~/.cache

Expected results:
They should be copied as files

Does this happen every time?
yes

Other information:
I don't know if it's a file-roller bug, a nautilus bug or a lower level bug. Please feel free to move this bug report.