Makecab Umlaut character problem in filename

Hi,

I wrote a project which will download a cab file from the web and extract (extract utility) and replace the files on the local machine. So before replacing the files I make a cab of the old files with makecab utility. For this i use a ddf file and makecab with the option /f and the ddf filename.

The problem is that whenever the file name contains any umlaut character the makecab displays an error file cannot be found. But if i save ddf file again in ASCII format and then try making a cab it works. But i cannot do this as certain characters cannot be represented in ASCII and i cannot avoid the umlauts as I am working in germany, where umlauts are comman. Is there any solution to it.

The project is in VB.Net 2005.

Thanks

Suba