if the bgt manual didn't cover it, then how would any of us know?

Seriously, you had to create multiple topics asking the same question?
To write a dictionary to a file you serialize it and then write the result.  To load you would use the inverse. That is, read, deserialize, and then get values.
No code will be provided, it is your job to look up the necessary functions.  I will tell you that you had most of what was required in your other topic with the same issue.

Ok guys this is the last time for a long time i'm gonna ask question related to this in this forum. So, i believe i figured out how to save the data so that it loads back when the game launches. This is a completely new code, and i get this error. My code is also included. I tried to figure out what's wrong with my code but found nothing.
Code:

int cash=50000;
file test;
dictionary data;
tts_voice voice;
void main()
{
voice.speak_wait("you have"+cash);
while(true)
{
if(key_pressed(KEY_RIGHT))
{
cash=cash-20000;
}
}
save();
}
data.set("cash",cash);
test.open("data.txt", "wb");
test.write(data);
test.close();
bool load(string save)
{
if(data=="")
{
return false;
}
dictionary @data=deserialize(data);
reset();
data.get("cash",cash);
test.open("data.txt", "rb");
string data=test.read();
test.close();
}
Error:

File: C:\Users\marco\Documents\test.bgt
On line: 17 (5)
Line: data.set("cash",cash);
Error: Expected identifier

File: C:\Users\marco\Documents\test.bgt
On line: 17 (5)
Line: data.set("cash",cash);
Error: Instead found '.'

File: C:\Users\marco\Documents\test.bgt
On line: 18 (5)
Line: test.open("data.txt", "wb");
Error: Expected identifier

File: C:\Users\marco\Documents\test.bgt
On line: 18 (5)
Line: test.open("data.txt", "wb");
Error: Instead found '.'

File: C:\Users\marco\Documents\test.bgt
On line: 19 (5)
Line: test.write(data);
Error: Expected identifier

File: C:\Users\marco\Documents\test.bgt
On line: 19 (5)
Line: test.write(data);
Error: Instead found '.'

File: C:\Users\marco\Documents\test.bgt
On line: 20 (5)
Line: test.close();
Error: Expected identifier

File: C:\Users\marco\Documents\test.bgt
On line: 20 (5)
Line: test.close();
Error: Instead found '.'

Sorry guys, but whatever i try, whatever lines i remove, it just won't fix. I get more interesting errors. Here is my code:
int cash=50000;
file test;
tts_voice voice;
void main()
{
string data=test.read();

voice.speak_wait("you have"+cash);
cash=cash-20000;

dictionary reset;
test.write(reset);
dictionary @reset=deserialize(data);
reset.get("cash",cash);

}
And the error:
File: C:\Users\marco\Desktop\testi\test.bgt
On line: 4 (1)
Information: Compiling void main()

File: C:\Users\marco\Desktop\testi\test.bgt
On line: 13 (6)
Line: test.write(reset);
Error: No matching signatures to 'file::write(dictionary&)'

File: C:\Users\marco\Desktop\testi\test.bgt
On line: 13 (6)
Information: Candidates are:

File: C:\Users\marco\Desktop\testi\test.bgt
On line: 13 (6)
Information: double file::write(string&in) const

File: C:\Users\marco\Desktop\testi\test.bgt
On line: 14 (13)
Line: dictionary @reset=deserialize(data);
Error: 'reset' is already declared

This is so confusing, i think i did everything right...

also, and I know this means I'm officially a hippocrit, choose a different language if you aren't grasping bgt. I mean, in the time you've spent learning it, you seemed to have half-grasped a few things. try soething else if it's not working. like python, pure basic, I don't know. those would be the two coming into my head when I think beginner programmer.

When sample of your work will be available?