I am not sure if is my fault or not on writing content to existing file:
If I do a write with an smaller content, the file is keeping the extra "piece".
If I delete (kill) and create, goes right.

Is there a trick to writing correctly (and truncating the rest if necessary) ?

Example I have a file with 1000 bytes, and I write 995, the file doesn't get truncated, keeps 1000 bytes (5 trash bytes)

Thanks

Its all explained in the wiki: /lang/open - Gambas Documentation

Do you use the Create keyword with Open to clear the existing content?

 My problem always is the long usage of other languages.

In them, WRITE operation usually included "truncating", meaning almost an "overwrite".

CREATE seems to be to use only if the file didn't exist.  Now I understand.

Thanks for all