I use DosBox to make an android compatible version. (In android it works with Magic DosBox.)
The question of the directories is the following:
The version for android was, in the pc:
Mount  C C:\Basic
Having C:\Basic\Windows\Debug\File
For the program:
Nom1$ "C:\Windows\Debug\File"
In android in the explorer it is necessary to create the Windows and Debug folders.
The version for QB64 was:
Nom1$ "C:\Windows\Debug\File"
It gives me an error so I moved the file to a directory outside the windows directory.
On the other hand
Can I compile QB64 for android?

Before the last update of Windows 10, the code did not give error.
NOM1$ = "C:\Textos\Texto.txt"
OPEN NOM1$ FOR OUTPUT AS #1
Now gives error : Permission denied.
The same program in Qbasic, using dosbox, does not give error.
I guess it will happen to others as well.