Wave loop ranges in Cubase 5

How to you set start and end of the wave loop within the file and save it of course as a wave that when loaded into a sampler remembers the loop range within?

OR

is there any free wave editor to do that?

I would appreciate some hints

https://www.google.com/search?q=acid+properties+in+cubase&ie=utf-8&oe=utf-8