a strange undeletable file

Hello everyone!

For 2 week i have got a very strange file that showed up in my trash.
The file has the icon of a normal Alias-file. But the fider shows zero KB in the trash.
If I am going to view the file-Information it disappeares. The trash lookes empty then, but the strange file appears back when I am close the Trash´s Finder-Window.
I did several Attempts to delete the trash both ways, the quick one and the secure one. But the file allways disappears only until I close the trash. Than it is back in there again.
I tryed to move the file out of the trash but it just disappeared only to show up again in the trash as if noting happened.

The file is named like: "/////ö///"
and it is made in 1.1.1904 (very unlikly 😉 as the Information sayes.

The Disk-Administration-Tool did not show any defects or problems with my harddisk.

I have got windows XP installed with bootcamp at an extra partition.
(but within this windows I dont have configureted a internet connection.
I dont use the internet with windows)
Might Windows cause the problem)?

Thanks if anyone could help me!

(I hope you got my problem due my bad english)

Greetings, Kristian