My files are in a compressed state (bz2). When the user clicks the link, I want them to get the uncompressed version of the file.
After decompressing the file, I ran into the problem, that the download dialog would always pop up, even when I told the dialog to 'Always perform this operation with this file type'.
As I found out, the problem was in the header directive 'Content-Disposition', namely the 'attachment' directive.
If you want your browser to simulate a plain link to a file, either change 'attachment' to 'inline' or omit it alltogether and you'll be fine.
This took me a while to figure out and I hope it will help someone else out there, who runs into the same problem.
