If you expect to double click a project file and Qgis opens, then only one version of Qgis can be registered for .qgs file extension at a time. I am sure this is the same on most OSs.

Other things to look at can be the value of some of the environmental variables listed in the batch file and whether they point to the correct path. e.g, OSGEO4W_ROOT


On 06/04/18 20:50, Juerg Lindauer wrote:
Hi

I have two versions of qgis in my system (Win 10) installed. QGIS
2.18.15 and 3.0.1.

To open a project file i use right-click and choose the specific batch
file.
After installing 3.0.1 the batch file  'C:\Program Files\QGIS
3.0\bin\qgis.bat' open the project file with QGIS 2.18.15.

The content of qgis.bat ist:
@echo off
call "%~dp0\o4w_env.bat"
call qt5_env.bat
call py3_env.bat

path %OSGEO4W_ROOT%\apps\qgis\bin;%PATH%
set QGIS_PREFIX_PATH=%OSGEO4W_ROOT:\=/%/apps/qgis
set GDAL_FILENAME_IS_UTF8=YES
rem Set VSI cache to be used as buffer, see #6448
set VSI_CACHE=TRUE
set VSI_CACHE_SIZE=1000000
set
QT_PLUGIN_PATH=%OSGEO4W_ROOT%\apps\qgis\qtplugins;%OSGEO4W_ROOT%\apps\Qt5\plugins
start "QGIS" /B "%OSGEO4W_ROOT%"\bin\qgis-bin-g7.4.0.exe %*

How can i open the project file directly with the specific qgis
Version?

Thanks,
Juerg Lindauer

Amt für Landwirtschaft
Abt. Agrarmassnahmen und Bodenrecht
Hirschistrasse 15
Postfach 5182
6431 Schwyz
Telefon: 041 819 15 17
Telefax: 041 819 15 19
E-Mail: juerg.linda...@sz.ch
Internet: www.sz.ch/landwirtschaft


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