http file download

I have two files which users can select to download
x.exe (windows) or x.dmg (mac)

the html code reads
<a href="">File x windows</a>
<a href="">File x mac</a>

when a user clicks on File x windows it downloads the file
if a user clicks on FIle x mac they get a 404 error

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It's probably a web server config problem:
Here's a hint:
file name extention : dmg
MIME type : application/octet-stream

To know if it's a webserver problem, the Windows link should work on the Mac (download only, not actually running it), and the Mac link should fail on Windows.

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HalCHubAuthor Commented:
I don't need hit I need answer
Depends on your webserver of course, which you didn't mention.
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