Information regarding QFile

[Raghaw]

Why does Qfile treats a file as unopened if it is used by some other application/process?

[tbscope]

Because it is unable to open it?

[SixDegrees]

Because the "open" or "closed" state of a file is determined by filehandles, not by what other processes or procedures are doing with the file. A file is always unopened until your code opens it for access.