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We have upgraded from QGis 1.8 to QGis 2.2. Qgis 2.2 is first installed, then 1.8 removed. Since then it is impossible to open .qgs-projects directly from windows explorer. We have checked explorer, file extensions and relinked to C:\Program Files\QGIS Valmiera\bin\qgis.bat . But it doesn't help.
We get the error 'qgis_core.dll cannot be found, please reinstall'. But that is rather drastic.
I use windows xp.
The file association is a bit crude under Windows 7. It does not like the association with a .bat file, and grabs the qgis-bin.exe in your case.
There are several file associations stored in the registry, which can not be easily accessed from the explorer menu, as it was under Windows XP.
You find the key under
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.qgs\OpenWithList
If you remove all .exe associations from the list, the .qgs should be opened with the bat.
You may find a few utilities here:
https://superuser.com/questions/136133/how-do-i-set-advanced-file-associations-in-windows-7
Or reinstall QGIS 2.2 in a new folder.
A simple solution is to use the program: Default Programs Editor available from: https://defaultprogramseditor.com/
For example I used the options: File Type Settings -> Context Menu -> QGZ -> QGIS 3.20.1 ; qgis.bin ; QGIS icon
Hope it helps....
