I'm using IExpress to generate .exe installer.

I want to make it generate log file into temp folder like this.

```
msiexec /i MyPackage.msi" /l*v "%temp%\MyPackge.log"   

```

but after a bit of research I found that `IExpress` use `command.com` not `cmd.exe` so that it doesn't understand `%temp%`

So, I try changing it to 

```
cmd.exe /c msiexec /i MyPackage.msi" /l*v "%temp%\MyPackge.log"   

```

it seems work but there is a command prompt appears while installing which is not nice at all.

Anyway to fix this ?