Permissions for QGIS 3 project files on Windows 10

Question

When saving a project under QGIS 3.x on a local Windows PC under e.g. c:tmp another user logged on to the PC cannot open the project due to lacking permissions. The project file saved from QGIS 3 permissiones are restricted to groups SYSTEM and Admin and for the current user:

Project files saved under QGIS 2.x have in addition full access for groups User and Everyone:

Changing permissions for the target folder (c:tmp) has no affect. Remarkable: This behavior does not apply to i.e. Layer definitions saved from QGIS 3, these have the same permissions as project files saved from QGIS 2 (cp.above screenshot).
Is this a bug or a feature or am I missing any settings?

Jochen Schwarze · Answer

Here is a workaround that catches the QgsProject.projectSaved signal and creates a batch file and executes it:
import os
from qgis.core import QgsProject

bat_tmp = """@echo off
             set quelle="path_to_qgz"
             icacls %quelle% /grant Jeder:(CI)(OI)(F)
             pause
          """

def setPermissions():
    
    qgs_path = os.path.normpath(QgsProject.instance().fileName())
    batch_path = os.path.normpath('c:tmppermissions.bat')
    
    with open(batch_path, 'w') as file:
        file.write(bat_tmp.replace('path_to_qgz', qgs_path))
    
    os.system(batch_path)

QgsProject.instance().projectSaved.connect(setPermissions)

This can be executed from python console editor or putted in a startup-script.

Permissions for QGIS 3 project files on Windows 10

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