Canon EOS 1D Software Instruction Manual page 223

The software doesn't run properly or doesn't run at all.
Is the preferences file for the software corrupted?
The preferences file for your software may be damaged.
Quit all active programs, delete the [Canon CameraCom Pref] file and the preference
files for the software you are using from the [Preferences] folder, and then restart the
software.
For OS X, double-click the startup disk
[Preferences] to open the [Preferences] folder and delete the target preference files.
For OS 9, double-click the startup disk
to open the [Preferences] folder and then delete the target preference files.
• Canon CameraCom Pref
• CanonEOSViewerUtility Pref
• PhotoStitch Pref
click the [Home] button
the [System Folder]
Communications and default settings file shared by all
software programs
Preferences file for EOS Viewer Utility
Preferences file for PhotoStitch
Troubleshooting
the [Library] folder
the [Preferences] folder
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