"File->Open" opens previous file after file has been updated

[winseros]

1. Have a pbo with a text file file1.txt.
2. Open the file1.txt notice its contents.
3. Replace the file1.txt with another file with another content.
4. Open the file1.txt. Notice the file1.txt content is from the original file. While the expected result is the file1.txt having the new content.