I'm also experiencing this bug with multiple installation disks in Lucid
beta 2. This includes disks I have successfully installed from while
running older versions of Ubuntu.

Trying to run any executable file from a CD or DVD results in an error
such as:

"The file '/media/Orange Box/Setup.exe' is not marked as executable.  If
this was downloaded or copied form an untrusted source, it may be
dangerous to run.  For more details, read about the executable bit."

If the .exe is copied to the computer the error persists until the box
is ticked in the permission preferences allowing for execution as a
program. Then the file runs through wine as expected.

The issue seems really to be that by default files are not given
permission to run as applications, and since files on an optical disk
are read-only it is impossible to grant them permission to run. I guess
in theory it would be the same for an internal file system that was
mounted read-only, but trying to run programs off CD is probably a
common enough action that this bug is worth further investigation.

I don't expect the majority of end users want to have to learn how to
mount their installation disks manually in order to change mount
settings, it should just be possible to run programs off a CD, as it has
been possible to in the past.

-- 
Windows executable on a DVD don't want to execute with Wine due to lack of 
executable bit
https://bugs.launchpad.net/bugs/561479
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