Nautilus doesn't regard to current directory( the one present in location
bar or the directory that is in current view). It seems that internally it
considers the home directory ( or the from where it began) as its current
directory.

To reproduce, follow the steps:

1. Go to /tmp

2. Create and compile this file:$ cat b.c
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

main()
{
int i;
int x;
char msg[]="12345678";

i = open("./data", O_RDWR | O_CREAT);
x = write(i, msg, 4);
}
$ 

3. Launch a nautilus. Nautilus by default goes to users home directory.
In my case it goes to /usr/user/test3.

4. Change the directory to /tmp

5. Run the a.out that got generated by step 2.

Result: It creates "data" file in /usr/user/test3 instead of /tmp.

Initially I was trying with "data" in open() call, then I changed 
it to "./data" but still it behaves incorrectly.

Expected Result: It should behave like shell. It should create the "data"
file in the directory from where it was launched. i.e. "data" should get
created in /tmp.