---
source: https://jimeh.me/blog/2007/safari-doesnt-always-like-bz2-compressed-dmg-files/
date: 2007-12-03
updatedDate: 2007-12-13
archive: zydev.info
tags:
  - macos
  - software
---

# Safari doesn't always like bz2 compressed DMG files

I noticed something weird this morning about the recent SimpleDock project I
released last night. The DMG is compressed using bz2 rather than the default
zli...

I noticed something weird this morning about the recent
[SimpleDock](http://zydev.info/simpledock/) (dead link) project I released last
night. The DMG is compressed using bz2 rather than the default zlib compression
used by default when creating compressed disk images.

Turns out Safari gets confused and guesses wrong a lot of the time with bz2
compressed disk images, and renames the downloaded file to `file.dmg.bz2` when
the server doesn't give a DMG specific MIME type. The end result is that you
have to remove the `.bz2` extension at the end or the file will be unusable. For
that you actually have to know of this issue tho, which not all end-users do.

This problem is easily fixed however if you use Apache by simply adding the
following to your `.htaccess` file:

```apache
AddType application/x-apple-diskimage .dmg
```

With this fixed, i still decided to upload a new copy of SimpleDock which is
compressed with zlib instead of bz2, simply cause the size difference was 14.23
KB, and Safari doesn't have any problems with zlib compressed disk images
regardless of MIME types. And also cause I wanted to make a minor change to the
uninstall info file :)

The only strange thing though is that the SimpleDock download worked fine last
night when i tested it, but this morning when I was testing some other stuff, I
noticed it didn't work properly anymore.

But oh well, it's all fixed and working now, and I don't feel like doing any
P.I. work today... lol