我有这个wxs文件，期望的是：1）如果env ZENWORKS_HOME存在它安装在那里，2）如果没有，它安装到Program Files。
我面临的问题是：
a）如果ZENWORKS_HOME env路径改变，默认为C:\Program Files\Novell\ZENworks\bin\preboot，我改为D：\，msi安装失败，错误代码
b）如果我删除了ZENWORKS_HOME env变量，那么它也无法安装。
以下是我的wxs文件的代码片段：
<Wix xmlns="http://schemas.microsoft.com/wix/2003/01/wi">
<!-- TODO: Create new GUIDs for the Product and Package Id. -->
<!-- TODO: Create a GUID for the UpgradeCode. This GUID must remain the same forever more
for your MSI...at least as long as you want the MSI engine to actually upgrade
between versions of your MSI -->
<!-- TODO: Fill out the Description field and the Product Name. -->
<Product UpgradeCode="5CB46018-7411-4049-BB2D-CF7414BC8618" Id="????????-????-????-????-????????????" Name="ZENworks Image Explorer" Language="1033" Version="$(var.version)" Manufacturer="Novell, Inc.">
<Package Id="????????-????-????-????-????????????" Description="ZENworks Image Explorer allows to you to view and modify the contents of a ZENworks image." InstallerVersion="200" Compressed="yes" />
<Condition Message="ZENworks Image Explorer requires that your computer is running Windows XP or Windows 2003 Server"><![CDATA[(Not Version9X) And (VersionNT > 500)]]></Condition>
<Media Id="1" Cabinet="Product.cab" EmbedCab="yes" />
<Directory Id="TARGETDIR" Name="SourceDir">
<Directory Id="ProgramFilesFolder">
<Directory Id="INSTALLATIONDIRECTORY" Name="DefltDir">
<Directory Id="bin" Name="bin">
<Directory Id="preboot" Name="preboot">
<Component Id="ZMGEXP_Start_script" Guid="CC1958FD-E438-4C13-9C97-D0A629AFB6A4" DiskId="1">
<File Id="zmgexp.bat" LongName="zmgexp.bat" Name="ZMGEXP1.BAT" Source="zmgexp.bat" />
</Component>
<Directory Id="nls" Name="nls">
<Component Id="ZMGEXP_Help_files" Guid="F70E341C-2B27-4FED-B1DF-DC8C311FF322" DiskId="1">
<File Id="ImgExplorerHelp.html" Name="IMGEXPH1.htm" Source="resources\helpfiles\ImgExplorerHelp.html" LongName="ImgExplorerHelp.html" />
</Component>
</Directory>
</Directory>
</Directory>
<Directory Id="lib" Name="lib">
<Directory Id="java" Name="java">
<Component Id="ZMGEXP_jar" Guid="B0F2E4AA-17AC-4B0A-8560-9DA8CE17790F" DiskId="1">
<File Id="zmgexp.jar" LongName="zmgexp.jar" Name="ZMGEXP1.JAR" Source="zmgexp.jar" />
</Component>
<Component Id="SWT_64_jar" Guid="51A737C4-F199-4366-A3A0-D374A7800A96" DiskId="1" Win64="yes">
<Condition>VersionNT64</Condition>
<File Id="swt_64.jar" LongName="swt.jar" Name="SWT_64.JAR" Source="swt-win64\swt.jar" />
</Component>
<Component Id="SWT_32_jar" Guid="9B01F63C-F125-4f6d-B729-A2CE6B303E35" DiskId="1" Win64="no">
<Condition>NOT VersionNT64</Condition>
<File Id="swt_32.jar" LongName="swt.jar" Name="SWT_32.JAR" Source="swt-win32\swt.jar" />
</Component>
.
.
.<snip>
<Upgrade Id="5CB46018-7411-4049-BB2D-CF7414BC8618">
<UpgradeVersion IgnoreRemoveFailure="yes" IncludeMaximum="yes" Maximum="$(var.version)" Property="UPGRADE_VERSIONS"/>
<UpgradeVersion OnlyDetect="yes" IgnoreRemoveFailure="yes" IncludeMinimum="no" Minimum="$(var.version)" Property="NEWER_VERSIONS"/>
</Upgrade>
<Property Id="UPGRADE_VERSIONS" Secure="yes"/>
<Property Id="NEWER_VERSIONS" Secure="yes"/>
<CustomAction Id="SetInstallationDirectory"
Directory="INSTALLATIONDIRECTORY"
Value="[%ZENWORKS_HOME]" />
<CustomAction Id="NEWER_VERSION_PRESENT" Error="A newer version already exists"/>
<InstallExecuteSequence>
<RemoveExistingProducts After="InstallFinalize"/>
<Custom Action="NEWER_VERSION_PRESENT" After="FindRelatedProducts">
NEWER_VERSIONS
</Custom>
<Custom Action="SetInstallationDirectory" After='CostFinalize'>[%ZENWORKS_HOME%]</Custom>
</InstallExecuteSequence>
</Product>
</Wix>