Qt IFW - Operation (exe) not executed

[rarrieche]

Hi, I'm trying to add one operation to execute an exe file (after copy and create the instalation dir), but it doesn't do anything, if I check the returns function it's true, in a log file there isn't nothing about error or something like that.
I used:
@
component.addOperation("Execute", "@TargetDir@\somedir\my.exe", "param1 ", "param2");
@
and even I tried with
@
component.addElevatedOperation("Execute", "@TargetDir@\somedir\my.exe", "param1 ", "param2");
@

I call them , when the installation is Finished, 'cause a I need TargetDir and others vars.
I'm running on Windows 8 64 bits, tried with QtIFW 1.3 and 1.4.

Any help, if something is missing or wrong? or is there another way to accomplish this?
Thx.