AW: Can I run 32bit TortoiseSVN on 64bit Win7?

Hi, Stefan,

> Von: Stefan Küng [mailto:tortoisesvn_at_gmail.com]
> > On 29.03.2012 08:27, Markus Schaber wrote:
>
> > Is it possible to create a combined installer which comes with both
> > 32 and 64 bit shell extensions and the 32 bit versions of all apps,
> > and just installs what's appropriate for the system? (Maybe even ARM
> > in the future?)
> >
> > Even if MSI is too limited, it can be extended by custom code,
> > AFAIK...
>
> Not possible, not even with extensions. And if you think about that a
> little bit you know why:
> Windows x64 can run 32-bit apps without problems. But to make that work, a
> 32-bit app has multiple redirections in place (registry, file system,
> ...) to make sure that it accesses only the 32-bit parts.
> For example, the path "program files" is left as is for x64 apps, but
> redirected to "program files (x86)" for 32-bit apps. And that's just one
> of the many, many redirections done by Windows.

I know about those things, and AFAIK there are functionalities which allow "knowing" applications to circumvent those redirections.

> Now, to get a unified msi, it must be 32-bit (64-bit wouldn't work on 32-
> bit OS). And that means that the redirections are in place.

Ah, I assumed that MSIs can be made "agnostic" (How else to install pure .NET applications which are "AnyCPU" and thus not fixed to a specific architecture). But my MSI knowledge is very basic.

> While there are ways to get around that using custom code, those won't
> work in an msi, at least not all.

Hmm... I did google a little bit, and found some of those ways (http://stackoverflow.com/a/6755553/160589 shows how to write registry keys for different architectures, and http://msdn.microsoft.com/en-us/library/windows/desktop/aa384129%28v=vs.85%29.aspx explicitly defines access to the "other" world of the registry in both ways).

But I guess it is not worth the efforts of complicating the installer that much.

> And don't forget: such an msi would be huge. Search this list for users
> complaining about the size of the msi...

AFAICS, it would not be much bigger than the current 64 Bit MSI, AFAICS - all applications could be provided once using 32-bit, only the shell extensions (and dlls) need to be provided for both architectures.

Never mind, it's not that important, after all.

Best regards

Markus Schaber

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