I downloaded a program (Tracktion, from www.mackie.com) and paid for
it but can't open it. It's a .DM file and my Mac doesn't know what to
do with .DM files. When I did a Web search for Macintosh and .dm I got
no worthwhile results.

I tried opening it with Stuffit Expander but Expander just quit.

Rig:
17" Macintosh Powerbook with 2 Gigs RAM, 1.33 GHz PowerPC G4, and OS X
10.2.8. Hard disk is 60 Gigs (I think) with at least 50 gigs free.
Edirol AudioCapture UA-20 for audio and MIDI in/out.

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Clarification of Question by fladget-ga on 07 Jun 2004 21:21 PDT

I see a file called stuffit_std_802_x_install.dmg is created. When I
double-click it I get a dialog box that says '
stuffit_std_802_x_install.dmg' failed to mount due to error 95. (no
mountable file systems.)

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Clarification of Question by fladget-ga on 08 Jun 2004 00:29 PDT

Still no luck. The above comment led me to this article, which says to
open Disk Copy and drag the .dmg file into it. I did, and got the same
error 95. It then says to run First Aid and fix file permissions. I
did. Same error 95. Here's the article:
http://docs.info.apple.com/article.html?artnum=107288

Next?

A .dmg file is a Macintosh "disk image".  Download it and save it on
your computer, then open it from within the Mac OS rather than the
browser.

Forum discussion related to this problem:
http://www.macfixitforums.com/php/showflat.php?Cat=&Board=Forum8&Number=613271&page=0&view=expanded&sb=5&o=31&fpart=

Google: mac dmg file
://www.google.com/search?&q=mac+dmg+file&btnG=X