open the options tab then filters then keyword and add it there. I am sorry for not pointing that out before. I understand how my answer could be misinterpreted

I have no idea how to help you with the "hall" coming up as "shall" problem

But I asure you that adding file extensions to the keyword filter works. I use that option myself to filter out .wma .wmv .asf .mov and sometimes other filetypes depending what I am lookin for.

remember to put the "." before the name of the fileextension to make it more effective and don't write *.wma only .wma

this will make your searches alot more effective, also if you want an avi but not a mpeg or similar you just add it before your search and remove it after you found what you were looking for

Also not all wma files are corrupt. Sometimes you will only find a song in wma format. Don't lose faith in the program only because you had one runin with some malware.

Use Bitzi to look the searchresult. You will often get helpful info there. And ALWAYS scan the file before opening them the first time.