I not have change anything with my file but now i can't even open it... Is their a way to safe my game?

I also get a debug file : [1025/185019:WARNING:message_in_transit_queue.cc(18)] Destroying nonempty message queue
[1025/210328:WARNING:message_in_transit_queue.cc(18)] Destroying nonempty message queue
[1025/210331:WARNING:message_in_transit_queue.cc(18)] Destroying nonempty message queue
[1025/210712:WARNING:message_in_transit_queue.cc(18)] Destroying nonempty message queue
[1025/212651:WARNING:message_in_transit_queue.cc(18)] Destroying nonempty message queue
[1025/214740:WARNING:message_in_transit_queue.cc(18)] Destroying nonempty message queue

but because i see only Free space, when i open the file with editor... i can't even try to fix this:(

You can open it in a text editor to correct bad XML, while opening it in Internet Explorer might help you find where the error, if the error did not give a line number (and sometimes the line number is the last line because it could not find something, which is no help at all).

if i open it with text editor. It just shows me a gigantic empty file without source code ...
I'm really afraid that something happened with the data!

ps:
i have test with a copied file to deleate all the free space...
If I do that, the file actually become smaller. Looks like there is a source coed, but i can't see it .:( (but malbe it realy was a bug whos detroy the complete file...)

ps2: well looks like i have to restart... but et least now i know how to programm my Enemys... So et least this will need less time now:(