Hi Hiro :-)
You don't mention which version of Windows you are using, but, try the
following and see if it helps:
In reset the correct file association for the files:
Open Windows Explorer
Find and highlight one of the files
Click Tools>Folder Options>File type
Scroll down the list until you find the file type you want the file to be
opened with
Click Change and then OK
Close and then try it again
Do this for each file type extension that is not working.
If the program that you want to open the file with is not in the list, then
you can add it by doing the following.
Highlight the file>right click>select Open with
If the program you want to open the file with is not in the list, click
Browse. Navigate to the program folder and highlight the application .exe
and click Open. Then check the box that says Always use the selected program
to open this kind of file
Then ok out
Hope this helps.
Jan

MS MVP - Windows IE/OE [DTS/AumHa]
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>I have a web page with a link to several files with various extensions.
>
> When you click the link with any files with .doc, .pdf, .sit, .zip
> extensions, a message box pops up asking if you want to save the file or
> open. Or if you right click the links with above extensions, you have a
> choice from the submenue to "save the target file as", but if you click
> the
> link with .sitx or some other uncommon file extensions, browser says that
> "can not find the file" or "file doesn't exist". However, if you change
> the
> file extension of the ".sitx" file to ".sit" then, you can download the
> exact same file (then after downloading, you need to change the extension
> back to ".sitx" before you open the file.)
>
> Does anyone know if there is a place where we can change the list of the
> downloadable extensions?
> Or this is something Windows does automatically and we are not able to
> custome change this setting?
>
> Please help...
>
> Hiro
>
>
>
>