Can't open project / permission error

I had this same issue... I was able to fix it by NOT changing the file directory of where the project is saved.

When you get to the Project Wizard "Directory, Name, Top-Level Entity" section, simply use the directory that is pre-populated (you can of course make as many subfolders as you need to stay organized). I use Quartus v13.

Correction:

I chatted with my prof. and it turns out saving to the installation folder (what I specified earlier) is not best. It will be better to run a 'compatability test' on the 'Quartus.exe' file which can be found in C:\altera\[your_quartus_version_here]\quartus\[bin/bin64]\Quartus.exe

To run a compatibility test, right click on Quartus.exe and click 'show more options' then click 'troubleshoot compatability'.

Hope this works!

If anyone finds this later, this is an error with how the attributes are set with the project files. See following link:

https://www.intel.com/content/www/us/en/support/programmable/articles/000084612.html

To solve this:

1. Open a command shell (Start menu -> Run... -> Enter cmd and press OK).

2. Change to the project directory, i.e. cd <project path> and press Enter.

3. Run the one of the following commands:

attrib -R /S /D *

This should clear the write protection flags for all the files and subdirectories in this project direcotry.

It is not necessary to delete or reinstall any files or directories.