OK, here's how I handle that.

Your directory structure should look something like this:

<Directory Id='TARGETDIR' Name='SourceDir'>
    <Component Id='Dummy' Guid='' />
</Directory>

Then, you have a CA set the TARGETDIR property, giving the install
location.  (This is covered in so many posts and replies, you should have no
trouble finding this)
<InstallUISequence>
    <Custom Action='DIRCA_TARGETDIR'
After='LaunchConditions'>TARGETDIR=""</Custom>
</InstallUISequence>

Thenm instead of having one CA target, you have one for each build
architecture.
<?if $(sys.BUILDARCH) = 'x64'?>
    <CustomAction Id='DIRCA_TARGETDIR' Property='TARGETDIR'
Value='[ProgramFiles64Folder][Manufacturer]\[ProductName]\' />
<?else ?>
    <CustomAction Id='DIRCA_TARGETDIR' Property='TARGETDIR'
Value='[ProgramFilesFolder][Manufacturer]\[ProductName]\' />
<?endif ?>

That's that!  One stop shopping.

On Tue, Jan 27, 2009 at 5:55 PM, Peter Oehlert <
poehl...@securityinnovation.com> wrote:

> I'm actually already using a <?if $(var.Platform)=x64?><?else?><?endif?>
> around the package element to make the MSI 64 or 32 bit. However my files
> are placed in ProgramFilesFolder\{my folder}. My issue is that
> ProgramFilesFolder is resolving to the wrong place in x64. I assume I can
> fix this if I use a <?if?> on each file element in each component and
> specify the platform as x64 or x86 appropriately and map it to the *SAME*
> binary file. I can do this because my binaries are platform agnostic.
>
> I was hoping there was something easier however.
>
>
> --Peter
>
> -----Original Message-----
> From: Christopher Karper [mailto:christopher.kar...@gmail.com]
> Sent: Tuesday, January 27, 2009 1:03 PM
> To: General discussion for Windows Installer XML toolset.
> Subject: Re: [WiX-users] platform agnostic file flag?
>
> MSI requires that the installer be marked as 32-bit or 64-bit.    I just
> made one WXS file that will work for both, then I set my target directory
> to
> the correct place for that platform.
>
> Chris
>
> On Tue, Jan 27, 2009 at 3:09 PM, Peter Oehlert <
> poehl...@securityinnovation.com> wrote:
>
> > I'm doing dual x64/x86 installers and my application is all based on .net
> > (MSIL) and is hence platform agnostic. Is there a way to specify a file
> as
> > platform agnostic in a component? Currently my x64 installer is putting
> > everything in Program Files (x86) b/c I don't specify the Platform=
> > attribute of the File element.
> >
> >
> >
> > Certainly others have this issue, I mean a text file is hardly platform
> > specific.
> >
> >
> >
> > Is this an MSI limitation?
> >
> >
> >
> >
> >
> > Any help would be appreciated.
> >
> >
> >
> > Thanks,
> >
> > Peter
> >
> >
> >
>
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