Thanx a lot for your answer 😉 !
But, it seems that there is something missing : this ("Emb_Project_UI.vi") vi's architecture is protected (I think that all NI vis are password protected). its interface doesn't contain any way to launch it from teststand or another VI, this make automating Vi compiling not possible using it ! there is also another Vi "_Launch_Emb_Project_UI.vi" that I'm curious about it! I don't know if this Vi can help for automating embedded project's launch !
in anycase, I'm sure that it is really important to automate FPGA's Vi comiling (it's a too slow and repeatif task )! I think that preventing this possibility in labview is something important and funny !
Thanx a lot for your help !