What in all HELL makes chrome try to download .aspx pages?
 

Most fucking annoying thing I've ever seen. I don't have DLM or any of that bullshit.

When it downloads the file it should appear at the bottom of your browser window. There will be a little arrow beside the name of the file it's downloading. Click the arrow and choose the option to "Always open this type of file". Close your browser, re-open and try again. If that doesn't work yet, clear your cache\cookies and try again. Should solve the issue.

Correct me if I'm wrong, but I thought that meant that the asp.net is not running on the site which will make Chrome or maybe other browsers treat the file like any other download file?.. :error

Either that or disable "Integrate IDM into browsers" if you're using that..

Correct - server is most likely providing the wrong MIME type:
http://en.wikipedia.org/wiki/Internet_media_type

I did that... didn't help, at all.. the worst part is that the files are only 5-6k and yet they just hang at 100% and then I have to close them before I can load another page (too many open connections to the site)

or fucked up content disposition header