Windows XP中的Windows-xp – inno setup.exe失败,浮点除以零

我设置了一个安装我的应用程序的inno安装脚本.生成的setup.exe将在 Windows Vista / 7上正确安装,但是在windows xp上以零错误排除失败.无耻的示例脚本在Windows XP上工作,因此它必须是我正在做的事情.
谁能看到我做错了什么？

; Script generated by the Inno Setup Script Wizard.
#define app_src_path "..\MyApp"
#define app_exe_path "..\bin"

#define file_ver GetFiLeversion(app_exe_path + "\win32\MyApp.exe")
#define app_ver Delete(file_ver,6,2)

[Setup]
AppId={{BBB40316-958C-446B-A08D-311273214AA6}
AppName=MyApp
AppVersion={#app_ver}
UninstalldisplayName=MyApp
AppPublisher=My Company US
DefaultDirName={pf}\My Company\MyApp
disableDirPage=yes
DefaultGroupName=My Company
disableProgramGroupPage=yes
#emit 'OutputBaseFilename="MyApp-Setup-' + app_ver + '"'
#emit 'SetupIconFile="' + app_src_path + '\rc\MyAppIcon.ico"'
Compression=lzma
SolidCompression=yes
ArchitecturesInstallIn64BitMode=x64
WizardImageFile=ZDS.bmp
WizardSmallImageFile=ZDSsmall.bmp

[Languages]
Name: "english"; MessagesFile: "compiler:Default.isl"

[Tasks]
Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: unchecked

[InstallDelete]
Type: filesandordirs; Name: "{app}\MyApp";

[Files]
; x64 files
Source: "{#app_exe_path}\x64\MyApp.exe"; DestDir: "{app}"; Flags: ignoreversion; Check: Is64BitInstallMode

; win32 files
Source: "{#app_exe_path}\win32\MyApp.exe"; DestDir: "{app}"; Flags: ignoreversion; Check: not Is64BitInstallMode

; platform independent
Source: "{#app_src_path}\rc\pic1-24.png"; DestDir: "{app}\rc"; Flags: ignoreversion nocompression
Source: "{#app_src_path}\rc\pic2-24.png"; DestDir: "{app}\rc"; Flags: ignoreversion nocompression
Source: "{#app_src_path}\rc\pic3-24.png"; DestDir: "{app}\rc"; Flags: ignoreversion nocompression

[Icons]
Name: "{group}\MyApp"; Filename: "{app}\MyApp.exe"
Name: "{commondesktop}\MyApp"; Filename: "{app}\MyApp.exe"; Tasks: desktopicon
Name: "{group}\{cm:UninstallProgram,MyApp}"; Filename: "{uninstallexe}"

[Run]
Filename: "{app}\MyApp.exe"; Description: "{cm:LaunchProgram,MyApp}"; Flags: Nowait postinstall skipifsilent

编辑：
这是/ LOG的输出

2012-07-14 10:07:50.855   Log opened. (Time zone: UTC-04:00)
2012-07-14 10:07:50.855   Setup version: Inno Setup version 5.5.1 (u)
2012-07-14 10:07:50.855   Original Setup EXE: E:\MyApp-Setup-0.0.0.exe
2012-07-14 10:07:50.855   Setup command line: /SL5="$801DE,623918,137216,E:\MyApp-Setup-0.0.0.exe" /LOG
2012-07-14 10:07:50.855   Windows version: 5.1.2600 SP3  (NT platform: Yes)
2012-07-14 10:07:50.855   64-bit Windows: No
2012-07-14 10:07:50.870   Processor architecture: x86
2012-07-14 10:07:50.870   User privileges: Administrative
2012-07-14 10:07:50.885   Exception message:
2012-07-14 10:07:50.885   Message Box (OK):
                          Floating point division by zero.
2012-07-14 10:07:51.654   User chose OK.
2012-07-14 10:07:51.654   Deinitializing Setup.
2012-07-14 10:07:51.654   Log closed.

我没有[代码]部分,所以我对MessageBox(OK)消息源自哪里感到困惑.