[PLUG] "command not found" errors with different distro. 32-bit vs 64-bit?

[Greg Helledy <gregsonh@gra-inc.com>]

After using Debian stable for many years (and many upgrades-in-place) I 
decided to do a fresh install.  I made a backup of my /usr/local 
directory and copied some of its contents back onto the new system. 
Now, when I try to run the games, I get a "command not found" error. 
This occurs from the command line, when I am in the directory where the 
script or executable is located, and results are the same whether I'm a 
regular user or root.

Example 1:
-----------------------------
pwd
/usr/local/games/ioquake3

(ioquake is a shell script which calls ioquake3.i386, an executable. 
Both have executable bit set.)

sh ioquake3
ioquake3: 48: exec: ./ioquake3.i386: not found

whereis ioquake3.i386
ioquake3: /usr/local/games/ioquake3
----------------------------
Example 2:
----------------------------
pwd
/usr/local/games/ut

(ut is a a shell script which calls System/ut-bin, an executable.  Both 
have executable bit set.)

sh ut
ut: 84: exec: ./ut-bin: not found

cd System
pwd
/usr/local/games/ut/System
ls|grep ut-
ut-bin

./ut-bin
bash: ./ut-bin: No such file or directory
-----------------------------


Old system:  Debian squeeze i386
New system:  Linux Mint 13 amd64 (which is based on Ubuntu 12.04, an LTS 
release)

In both cases I am using KDE.

Is this an issue with 32-bit executables on a 64-bit os?  If so, is 
there a way to fix it so I can run my "antique" games?  If not, what am 
I doing wrong?

Thanks for any ideas,
Greg


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