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Describe the issue
`The configuration file could not be opened.` when clicking on `Open Configuration File`

What behavior did you expect?
Expected to open bitcoin.conf

<!--- What was the actual behavior (provide screenshots if the issue is GUI-related)? -->

How reliably can you reproduce the issue, what are the steps to do so?
Lanuch Bitcoin Core
![](https://i.imgur.com/gTR1bGS.png)
![](https://i.imgur.com/KHkJVM3.png)

What version of Bitcoin Core are you using, where did you get it (website, self-compiled, etc)?
https://bitcoin.org/en/download
v0.17.1

What type of machine are you observing the error on (OS/CPU and disk type)?
OSX

<!-- For the GUI-related issue on Linux provide names and versions of a distro, a desktop environment and a graphical shell (if relevant). -->

<!-- Any extra information that might be useful in the debugging process. -->
<!--- This is normally the contents of a `debug.log` or `config.log` file. Raw text or a link to a pastebin type site are preferred. -->

#include <shlobj.h>
#include <shlwapi.h>
#endif
#include <QAbstractItemView>
#include <QApplication>
#include <QClipboard>
#include <QDateTime>
#include <QDesktopServices>
#include <QDesktopWidget>
#include <QDoubleValidator>
#include <QFileDialog>
#include <QFont>
#include <QFontDatabase>
#include <QFontMetrics>
#include <QKeyEvent>
#include <QLineEdit>
#include <QMouseEvent>
#include <QProgressDialog>
#include <QSettings>
#include <QTextDocument> 
#include <QThread>
#include <QUrlQuery>
#if defined(Q_OS_MAC)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#include <objc/objc-runtime.h>
#include <CoreServices/CoreServices.h>
#endif
namespace GUIUtil {
QString dateTimeStr(const QDateTime &date)