Skryme - yes!
The script uses a vbscript command called "invokeverb" which fires the relevant command on the context menu of a ed item.
So...for example, the options you say don't work, are executed with the following lines of code:
objFolderItem.InvokeVerbEx("Empty Recycle &Bin")
objFolderItem.InvokeVerbEx("&Open")
objFolderItem.InvokeVerbEx("P&roperties")
if you look in the brackets, that text you see there mirrors the command on the recycle bin right click context menu of an english language version of XP. As such it won't work on another language version.
However, it is possible for me to attempt to add Finnish support for this object if you could tell me the text for those commands as they appear in your OS, as well as the Finnish equivalent for the "&Delete" command on the right click menu for general files and folders. Note the use of the character "&" - this denotes that the character immediately following it is underlined as it appears in the menu. Also, I imagine it's important to know which letters are capitals and which are not.
Once I have that info, and if I can find a way to determine the language of the OS via script, then I can try and add Finnish support to this object