os.listdir(<file specifications>) doesn't work ??

[Stef Mientki]

hello,

I want to find all files with the extension "*.txt".
 From the examples in "Learning Python, Lutz and Asher" and
from the website I see examples where you also may specify a wildcard filegroup.

But when I try this
   files = os.listdir('D:\\akto_yk\\yk_controle\\*.txt')

I get an error message

   WindowsError: [Errno 123] The filename, directory name, or volume label syntax is incorrect: 
       'D:\\akto_yk\\yk_controle\\*.txt/*.*'	

What am I doing wrong ?

thanks,
Stef Mientki