How to install ORCA:

1. Download: ORCA.MSI
2. Double-click the file on the computer where you want to install ORCA.

Alternatively you find the orca.msi installation file in Microsoft's Platform SDK.

MST files also can be created with the free Custom Installation Wizard from Office XP resource kit (orktools.exe, 11,5 MB) or with the InstallShield Tuner (part of AdminStudio, fee required).