Ånd here is what the crash log says...

Host Name: Macintosh
Date/Time: 2005-05-02 12:36:52.494 -0700
OS Version: 10.4 (Build 8A428)
Report Version: 3

Command: Installer
Path: /Applications/Utilities/Installer.app/Contents/MacOS/Installer
Parent: WindowServer [56]

Version: 2.0 (83)

PID: 276
Thread: Unknown

Link (dyld) error:

Symbol not found: _IFDocument_Special_MIMEType_Pathname
Referenced from: /Applications/Utilities/Installer.app/Contents/MacOS/Installer
Expected in: /System/Library/PrivateFrameworks/Install.framework/Versions/A/Install