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I have an old Macbook pro with QGIS 3.10 installed. I have not been able to open any QGIS projects I have saved because of this error -> There is no application set to open the document “test project save.qgz”.

I was thinking this was most likely a problem of where I had QGIS installed on my computer. I checked and it is under Macintosh HD -> Applications. I have another Applications folder if I go to my user profile from Mac HD which does not seem to have QGIS or R or several other of my apps I regularly use. Instead that folder has many games I play. I am the only user of my computer and so there is only my profile and the default guest one which is empty.

I dont think that QGIS being in the base applications folder for all users should be problematic. That being said, I have no idea why I am getting this error when trying to open my saved QGIS projects. I have used QGIS quite a bit for school and personal interest. I never had a problem when opening saved QGIS projects on school computers other then them being so slow. I have been getting by with just saving layers which is annoying because it doesn't save the properties of layers either.

Please Help if you can, either with being able to save properties of layers on saved layers or with troubleshooting my issue of opening saved projects. Thanks!

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  • Two hints: Did you to save your projects (on another computer) in the (old) qgs-format instead of the newer, zipped qgz-format? And did you try to open the project from the QGIS-window: menu project - open instead of double-clicking the qgz-file?
    – Babel
    Jul 3, 2020 at 21:56
  • For the other question: the properties of layers (at least their style) can be saved separately as layer-styles, see e.g. here: gis.stackexchange.com/questions/77069/…
    – Babel
    Jul 3, 2020 at 22:00
  • For any further advice, it would be good to give more information: on what system did you create your qgz-projets (Mac as well? or Win/Linux?), which QGIS version are you using (both the version you used to save the file as the one you use to open it) etc.
    – Babel
    Jul 3, 2020 at 22:03
  • Thanks for responding quickly! It does work for me to open the projects through QGIS. It does not when I try opening from files. So that is a good solution. It would be nice if I could open the project simultaneously though. For my projects I was trying this on, its the same version as I am currently using - 3.10. This has been a problem of the past for me too... I am just now trying to fix them. Thanks for the link to the layer style solution. If someone else knows what the issue with opening the project via file instead of through QGIS, that would be great too. Jul 3, 2020 at 22:33

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You don't seem to be the only person with this kind of problem, seems to be a bug: https://github.com/qgis/QGIS-Mac-Packager/issues/31

There you find some workarounds as well. One workaround however works for you, opening the project file from the QGIS window. Again, saving your projects as qgs instead of qgz should be another solution, please confirm.

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    Yes, using the qgs works. This is probably the best workaround as you can open it from the file itself instead of through qgis. You will need to zoom to layer to see your project however. Jul 28, 2020 at 18:52

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