Well i want to ask someone to post here a link to download program that edit .eng files.I downloaded from here a new sounds for XRT (Blow off,backfire) but they are in wav format not a eng format and in the game i can't load it (with shift+a) .Help

LFS is the only program that loads and edits .eng files. There is no need for any others.

With the wav file, you need to load the sample into one of the sound categories that shift A presents, rather than trying to load the .wav file as a whole engine sound.