Configuring Crystal's temp directory

I am using CR 2008 (merge module installation)

I want to use a non-default temp directory for report generation because the default C: drive is low on space.

I have tried the steps given here: http://blakepell.spaces.live.com/blog/cns!808E32F75B9CF425!178.entry (direct registry edit), but I see no change.

Questions:

1. How do I configure the temp directory?

2. What do temp files look like as they are being generated? (File name / extension?)

Thanks!