When i extracted the file from a rar file all the files in the folder
disappeared

Luckily i found out what happend (i guess). Iv'e tried to reproduce the
error. I'm running WinXP eng (location Denmark), TC 6.01 and
WinRAR 3.20.
Please take a look at this gif.
http://2105.dk/temp/tc_bug.gif
Make a folder where the name contains at least 9 characters and one of
the characters is an "ø" (Alt+0248).
Put some files in the folder. Try to put an "ø" in their names.
Compress the files to a rar file.
In the rar file you'll find the files. The "ø" seems to have become an "o".
Drag one of the files out of the archive. Up on [..]
Click [Overwrite]
Now the rar file disappear and a new folder have been created. It's called
the same as the first folder i made, except the "ø" have been switched to
an "o"
The two folder contain the same file.
Delete the "self-made" folder, you'll be able to find the rar file again.
Could someone please test this behaviour?