File Association?

[skrath]

When one .c file is open in CodeBlocks, I am not able to open another .c file from the Windows Explorer (by double clicking on it) in a 2nd tab in the CodeBlocks IDE.
If I double click on the file, the simply CodeBlocks IDE comes into focus without opening the file.
In my Environment setting, I have multi-instances checked out; open in the same instance checked in.
Can anybody suggest a solution?

[ampleintend]

The issue is that Windows is not passing the file path to Code::Blocks when you double-click.
Here is a quick fix I suggest:

• Go to Windows → Settings → Default apps → Choose default apps by file type.
  Select the .c extension and set Code::Blocks as the default app; ensure that the command includes " %1" to open the file.
  Alternatively, you can drag and drop the file into the IDE, or use "Open with" → Code::Blocks.

Once done, double-clicking the file should open it in a new tab.