Setting InstallDir from reg key but manipulating first.

Hello Mr DJ. Long time lister, first time caller...

I've only just stared using NSIS and despite reading, re-reading, browsing the FAQ and archives I've got myself in a tizz over this little problem.

I would be ever so greatful is some kind soul could help me out of my quandry.

First up, I'm using 2.0b3 and the Modern User Interface - just so you know.

Problem is as follows. When my user comes to the "Choose Install Location" section, I need to pre-set what that install dir will be.

Now, the actually path I want is in the registry BUT, and this is the catch, I need to manipulate it before its set as InstallDir.

Heres the problem.

My install path can be read from:
HKCU\Software\Company\Product\InstallPath

which returns something like:

C:\Program Files\Product\UserName\Prefs

Now, what I need to do is alter that returned value by removing the "Prefs" part and appending some extra info to it. e.g.

C:\Program Files\Product\UserName\Data\NewStuff

The "Data\NewStuff" will be defined as a variable in the script and the above modified path should be what appears in the Install Location dialog and also be the value of $INSTDIR (or some other suitable var such as $OUTPATH).

Now this has got me foxed because the users who will be using this installer are not *that* bright hence the need to prompt them with the correct path in the directory text box.

To be honest, the NSIS scripting language does confuse me a bit and I cannot figure out how to achieve this so I would be awfully greatful is someone could help me out.

Thanks in advance.

- Jed

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