The https://sourceforge.net/p/codeblocks/code/HEAD/tree/trunk/src/CodeBlocks_wx31_64.workspace (https://sourceforge.net/p/codeblocks/code/HEAD/tree/trunk/src/CodeBlocks_wx31_64.workspace) file has the CodeBlocks_wx31_64.cbp as the first entry:
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
 <CodeBlocks_workspace_file>
 <Workspace title="CodeBlocks Workspace wx3.1.x (64 bit)">
 <Project filename="CodeBlocks_wx31_64.cbp" active="1" />
 <Project filename="tools/Addr2LineUI/Addr2LineUI_wx31_64.cbp" />
        <Project filename="plugins/contrib/ToolsPlus/ToolsPlus_wx31.cbp">
            <Depends filename="CodeBlocks_wx31.cbp" />
        </Project>
    </Workspace>
</CodeBlocks_workspace_file>
		<Project filename="plugins/contrib/symtab/symtab_wx31_64.cbp" />
		<Project filename="plugins/contrib/ThreadSearch/ThreadSearch_wx31_64.cbp">
			<Depends filename="plugins/contrib/wxContribItems/wxContribItems_wx31_64.cbp" />
		</Project>
		<Project filename="plugins/contrib/ToolsPlus/ToolsPlus_wx31_64.cbp" />
		<Project filename="CodeBlocks_wx31_64.cbp" />
	</Workspace>
</CodeBlocks_workspace_file>