You didn't specify which authoring tool (if any) you are using. The following is phrased as appropriate for ISWI 2.03, but you should be able to use the answers even if you're just tweaking the tables with orca...
There's a bunch of different ways you could do it. Is Regini.exe on the client machine? Assuming it's in the system folder, what _I_ would do is:
Custom Action (Type 34 if you want a 'return code', 98 if you don't - assuming you're not using a tool. ISWI sets the type automatically)
Launch an Executable
Stored in Directory Table
Source: SystemFolder
Target: [SystemFolder]regini.exe regfix.ini
(use full path for regfix.ini)
Immediate execution
Note that the 'source' property does not have [] around it, but the target does - this is intentional. The 'source'
Put it in the 'execute' sequence after 'InstallFinalize' (i.e. highest sequence# in execute).
(Edited by Tom at 9:25 am on July 31, 2001)
(Edited by Tom at 9:26 am on July 31, 2001)