Take the 2-minute tour ×  My Mac G4 (running OS X 10.3.9) won't
install from any .dmg file I download. It keeps popping up a
message: "name of setup & no mountable file system" or
"application file cannot be found". Is there some setting I need
to change to get around this problem as I need to install some
extra programs urgently.  share|improve this question Poorly
worded question. Need more info. Detailed error messages.
Possible duplicate: apple.stackexchange.com/questions/9364/… – 
user588 Mar 13 '11 at 20:32  2 Answers 2  It is likely the disk
images do not support Mac OS X 10.3.9.  The command line tool
used to create disk images is called hdiutil. This hdiutil
manual page documents the DMG format's history and compatibility
with older editions of Mac OS X.  hdiutil manual page
share|improve this answer  I think a lot of the DMGs that you
find on the internets today are compressed, which older disk
utilities may not support. You might be SOL here =\ (unless you
upgrade or has another computer with a ne