Can't start an executable python program

[mikiper98]

So, I want to start off by saying i'm sorry if i'm posting this in the wrong section.
Basically i have a python program that includes tkinter, reading and writing from txt files and ecc... , i want to start it in autostart, but it didn't work, i tried everything i found online and didn't worked so now i tried to open it in the terminal using:

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/home/pi/Desktop/Program.py

and gave me this error

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Traceback (most recent call last):
  File "/home/pi/Desktop/Program.py", line 11, in <module>
    w=open("file.txt","r+")
IOError: [Errno 2] No such file or directory: 'file.txt'

file.txt is a file that i need to open to access some data, the thing that i don't understand is that if i run my program with:

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python Program.py

it works without any problem.
Do you know why this happends or you guys know a way around this issue?
Thanks

[neilgl]

Which directory is file.txt in?
Also that post talks about Prova.py ?

[jahboater]

Looks like you are running the program in two different places.
When you open the file, you should give it the full path such as "/home/pi/Desktop/file.txt".
The environment variable $HOME may be useful unless you are starting it from /etc/rc.local or cron.

[mikiper98]

Which directory is file.txt in?
Also that post talks about Prova.py ?

file.txt is still in the Desktop folder, the same as Program.py
Prova.py was a typo sorry

[mikiper98]

Looks like you are running the program in two different places.
When you open the file, you should give it the full path such as "/home/pi/Desktop/file.txt".
The environment variable $HOME may be useful unless you are starting it from /etc/rc.local or cron.

It works!!!!
It was easier than expected... i would never think about that thank you!