will an asp application run on all browsers

will an asp application run on all browsers. is there any difference in msn explorer 9.
i have an application which runs on all browsers except msn explorer 9. (works on msn explorer 6 also).

The application is to download images from the application to the local system. In msn explorer 9, the download dialog comes with the name save.htm irrespective of the image name.

The behaviour of the application is different for the msn explorer 9. The page is getting re submitted soon after the response.end() statement
Can any one help me regarding this statement