in src/main/org/apache/ant/dotnet/wix/WixTask.java [435:446]
private File getTarget(File s) {
String name = s.getName();
int dot = name.lastIndexOf(".");
if (dot > -1) {
name = name.substring(0, dot) + ".wixobj";
} else {
name = name + ".wixobj";
}
return wixobjDestDir == null
? new File(name) : new File(wixobjDestDir, name);
}