Add registry key to package?

Definitely. You need to define the REG file as an Additional Included File in the package definition, and then call REG IMPORT or REG MERGE using that *reg file in the PostExecution step.

Thanks LGarvin.  I will give that a try today.

I have tried it as follows, but without success:

Add a post package file - Run Program - Reg.exe Import WordQ.reg

I have placed the reg.exe file and WordQ.reg file in the package.

Below is an extract from the error logging file.  I think I have just not used the correct syntax.

ogramobject::execute(exe) called for program name: C:\WINDOWS\SoftwareDistribution\Download\Install\Reg.exe Import WordQ.Reg
2013/01/29 11:13:58:259 PID: 3944 TID: 472 installer::runexepackage called for path: C:\WINDOWS\SoftwareDistribution\Download\Install\Reg.exe Import WordQ.Reg with command line: .
2013/01/29 11:13:58:259 PID: 3944 TID: 472 installer::runexepackage CreateProcess called with fqcommandline: "C:\WINDOWS\SoftwareDistribution\Download\Install\Reg.exe Import WordQ.Reg" .
2013/01/29 11:13:58:259 PID: 3944 TID: 472 installer::runexepackage() failed with pathtoexe with command line ("C:\WINDOWS\SoftwareDistribution\Download\Install\Reg.exe Import WordQ.Reg" ). Error Code: 2
2013/01/29 11:13:58:275 PID: 3944 TID: 472 programobject::execute(exe) completed for program name: C:\WINDOWS\SoftwareDistribution\Download\Install\Reg.exe Import WordQ.Reg and process exit code was: 0x2
2013/01/29 11:13:58:275 PID: 3944 TID: 472 ewException caught: Failed to execute process File: ExecutionEngine.cppLine: 1184
stack trace :

2013/01/29 11:13:58:275 PID: 3944 TID: 472 executionengine::executeinstructions() runpostexecute() return code: 0x2 and will not continue

Fixed it.  It was my syntax.  Resolved as follows:

Add reg.exe and <filename>.reg to package

In the Package Boot Manager add a post package Run Program of reg.exe with a command line of Import <filename>.reg

Just an additional point.. REG.EXE is already on the target system, there's no need to include REG.EXE in the package, just path it appropriately in the Run Program statement.