EOS Capture: a tool to be used with early Canon EOS devices. Contains
Mac OS 9 drivers.
This version (the only I found) is in Japanese, and so it seems the
application refuses to work on other language Mac OS installation;
that isn't the case for the drivers/extensions, which do not seem to
be region-locked.

Compatible Cameras:
\- Canon EOS-1D
\- Canon EOS-1Ds
\- Canon EOS-1D Mark II
\- Canon EOS-1Ds Mark II

NOTE: if you've got a English version, or multi-language version, of
the said application, please upload it here.

Compatibility
Architecture: PPC

Mac OS 9