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Mac OS X Developer Previews

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Guides on emulating older applications

This are the Developer Previews (not the public beta) of Mac OS X. This versions of the system were launched between May 1999 and May 2000, only for developing purposes.

In DP1 and DP2, OS X looks very similar to Mac OS 9, but it still have OPENSTEP elements. With DP3, Apple introduced the first version of Aqua, which evolved with every new beta version of the OS.

You can find more screenshots at

Mac OS X Developer Preview 1
Mac OS X Developer Preview 2
Mac OS X Developer Preview 3
Mac OS X Developer Preview 4

Thanks to WinWorld for upload this OSes! Smile

Architecture: PPC

64 MB of RAM, 1 GB of HDD, G3 processor


by taylordesign - 2016, December 3 - 10:18pm

Why aren't these copied/stored at Macintosh Garden? Should someone do that instead?

by os9er - 2016, December 3 - 8:58pm

Please re-do the download links, all of them now go straight to the WinWorld Software Library page.

MikeTomTom's picture
by MikeTomTom - 2015, October 27 - 9:13pm

  ...the download link for DP3 seems to give DP2.

The URL for DP3 is now fixed.

IIGS_User's picture
by IIGS_User - 2015, March 21 - 4:05pm

but the download link for DP3 seems to give DP2.

Seems so, but I think you simply must replace the 2 by a 3 in the URL before downloading the file.

by bunnspecial - 2015, March 20 - 10:26pm

I downloaded all four, but the download link for DP3 seems to give DP2.

Laurier's picture
by Laurier - 2015, March 1 - 8:26am

Screenshots 2,3,4 should be reupload,i was just curious to see what those Developer previews look like.

by SwedeBear - 2015, February 28 - 11:12pm

Nope. There are more for OS X; for example BetterZip and The Unarchiver. Both capable of handling 7zip. BetterZip being the better one IMHO.

by os9er - 2015, February 28 - 3:43pm

Or at least on a Mac theyʻre the only ones.

by os9er - 2015, February 28 - 3:42pm

Itʻs a 7-Zip archive, and the applications mentioned in my previous comment are the only ones that can open that type of archive, so I donʻt know Sad

by Troyd - 2015, January 2 - 11:41am

Not obviously. I downloaded DP4 and opened it on Win 7 using WinRAR. It decompressed without error. Might be a truncated download on your side. Try downloading again using a download manager.

by os9er - 2015, January 1 - 4:29pm

Download link for DP4 is broken; I downloaded it, tried to open it with both 7zX and Ez7z (I have an Intel iMac),and it didnʻt work with either of those applications. 7zX gave an error saying "Cannot open file as archive"; Ez7z gave me an error saying "There is no such archive" Sad So, obviously the file was not archived properly.

by os9er - 2014, March 18 - 7:31pm

I like the screenshots Smile

by max1zzz - 2014, February 16 - 5:56pm

i wouldn't think winworld really cares, there main reason for existence is to wind up the die hard betaarchive users (their server is practically a carbon copy of betaarchive's)

However i don't know how safe the links are, they did announce they where shutting down a while back, but it never seemed to happen

Protocol 7's picture
by Protocol 7 - 2014, February 16 - 11:55am

Does anyone?

IIGS_User's picture
by IIGS_User - 2014, February 16 - 8:55am

Do they like direct downloads linked from other sites?

David montesin's picture
by David montesin - 2014, February 15 - 10:34pm

hi all

i have reupload the link i found from it is in .7z

thanks David

uyjulian's picture
by uyjulian - 2014, February 14 - 4:22pm

broken link?

Dog Cow's picture
by Dog Cow - 2013, February 19 - 12:43am

Yes, of course we should upload it to another file sharing site that's just going to disappear or flake out like all the others.

espectalll123's picture
by espectalll123 - 2013, February 17 - 10:21pm

Also, torrents aren't very common here... :/

espectalll123's picture
by espectalll123 - 2013, February 17 - 10:20pm

OK... so torrent? Or there's another server fast and with no registering required?

IIGS_User's picture
by IIGS_User - 2013, February 16 - 6:58pm

Nice to know, thanks. Smile

by SwedeBear - 2013, February 15 - 8:43pm

Ah, as we're speaking Mega works on Firefox with a plug-in. Just a tip. Wink

IIGS_User's picture
by IIGS_User - 2013, February 15 - 5:04pm

MEGA is only compatible to Chrome which is not installed by all users.

espectalll123's picture
by espectalll123 - 2013, February 15 - 3:24pm

Hey, just more than a year since last time!!!

OK... do we upload it to MEGA, own server or just torrent? Now I have a fast Internet to upload the images Smile

Protocol 7's picture
by Protocol 7 - 2011, December 7 - 2:45pm

They'll work on a B&W G3 for sure. Not sure about beiges. They'll probably run on iMacs that were made before the DP releases. Any later models (like my Summer 2001 one) won't run them.

by xy - 2011, December 7 - 10:14am

Does anyone know whether these previews run on every G3 Mac? Or are there restrictions as with Rhapsody?

Fortuna Wave's picture
by Fortuna Wave - 2011, December 7 - 3:19am

In Mediafire or Rapidshare?

Protocol 7's picture
by Protocol 7 - 2011, December 6 - 5:39pm

DP2 was my favourite.

Considering the size it's probably better to upload these somewhere else rather than hotlinking them from winworldpc however.

espectalll123's picture
by espectalll123 - 2011, December 6 - 4:50pm

Well... This is my first page at Macintosh Garden. I hope you like this post Smile

ndtronerud's picture
by ndtronerud - 2011, December 6 - 4:44pm

How fascinating!