diff --git a/config/config_rrgv4.16717.json b/config/config_rrgv4.16717.json
index e355231..7fc7a3e 100644
--- a/config/config_rrgv4.16717.json
+++ b/config/config_rrgv4.16717.json
@@ -104,7 +104,9 @@
             "cmd": "hf mf darkside"
         },
         "save sniff": {
-            "cmd": "trace save -f <filename>"
+            "cmd": "trace save -f <filename>",
+            "path cmd":"prefs show",
+            "path pattern":"trace save path\\.+\\s*(.+)$"
         },
         "load sniff": {
             "cmd": "trace load -f <filename>",
diff --git a/src/module/mifare.cpp b/src/module/mifare.cpp
index 46baf7c..ca6b9ff 100644
--- a/src/module/mifare.cpp
+++ b/src/module/mifare.cpp
@@ -1375,3 +1375,18 @@ quint16 Mifare::getTrailerBlockId(quint8 sectorId, qint8 cardTypeId)
         // other cardTypeId: use current cardtype(include default -1)
         return (cardType.blks[sectorId] + cardType.blk[sectorId] - 1);
 }
+
+QString Mifare::getTraceSavePath()
+{
+    QVariantMap config = configMap["save sniff"].toMap();
+    QString pathCmd = config["path cmd"].toString();
+    QString patternText = config["path pattern"].toString();
+    QRegularExpression pattern = QRegularExpression(patternText, QRegularExpression::MultilineOption);
+    if(pathCmd.isEmpty() || patternText.isEmpty())
+        return QString();
+    QString result = util->execCMDWithOutput(pathCmd, 500);
+    QRegularExpressionMatch reMatch = pattern.match(result);
+    if(!reMatch.hasMatch())
+        return QString();
+    return reMatch.captured(1).trimmed();
+}
diff --git a/src/module/mifare.h b/src/module/mifare.h
index bc4d153..79663d9 100644
--- a/src/module/mifare.h
+++ b/src/module/mifare.h
@@ -115,6 +115,7 @@ public:
     QString data_getUID();
     quint16 getTrailerBlockId(quint8 sectorId, qint8 cardTypeId = -1); // -1: use current cardtype
     void setConfigMap(const QVariantMap& configMap);
+    QString getTraceSavePath();
 public slots:
 signals:
 
diff --git a/src/ui/mainwindow.cpp b/src/ui/mainwindow.cpp
index 2a183d7..3dd3e57 100644
--- a/src/ui/mainwindow.cpp
+++ b/src/ui/mainwindow.cpp
@@ -956,18 +956,31 @@ void MainWindow::on_MF_Sniff_loadButton_clicked() // use a tmp file to support c
 {
     QString title = "";
     QString filename = "";
+    QString defaultExtension;
+    QDir clientTracePath;
+
+    if(Util::getClientType() == Util::CLIENTTYPE_OFFICIAL)
+        defaultExtension = ".trc";
+    else if(Util::getClientType() == Util::CLIENTTYPE_ICEMAN)
+        defaultExtension = ".trace";
+
+    QString userTraceSavePath = mifare->getTraceSavePath();
+    if(userTraceSavePath.isEmpty())
+        clientTracePath = *clientWorkingDir;
+    else
+        clientTracePath = QDir(userTraceSavePath); // For v4.16717 and later
 
     title = tr("Plz select the trace file:");
-    filename = QFileDialog::getOpenFileName(this, title, clientWorkingDir->absolutePath(), tr("Trace Files(*.trc)") + ";;" + tr("All Files(*.*)"));
+    filename = QFileDialog::getOpenFileName(this, title, clientTracePath.absolutePath(), tr("Trace Files") + "(*" + defaultExtension + ")" + ";;" + tr("All Files(*.*)"));
     qDebug() << filename;
     if(filename != "")
     {
-        QString tmpFile = "tmp" + QString::number(QDateTime::currentDateTime().toTime_t()) + ".trc";
-        if(QFile::copy(filename, clientWorkingDir->absolutePath() + "/" + tmpFile))
+        QString tmpFile = "tmp" + QString::number(QDateTime::currentDateTimeUtc().toTime_t()) + defaultExtension;
+        if(QFile::copy(filename, clientTracePath.absolutePath() + "/" + tmpFile))
         {
             mifare->loadSniff(tmpFile);
             util->delay(3000);
-            QFile::remove(clientWorkingDir->absolutePath() + "/" + tmpFile);
+            QFile::remove(clientTracePath.absolutePath() + "/" + tmpFile);
         }
         else
         {
@@ -980,25 +993,41 @@ void MainWindow::on_MF_Sniff_saveButton_clicked()
 {
     QString title = "";
     QString filename = "";
+    QString defaultExtension;
+    QDir clientTracePath;
+
+    if(Util::getClientType() == Util::CLIENTTYPE_OFFICIAL)
+        defaultExtension = ".trc";
+    else if(Util::getClientType() == Util::CLIENTTYPE_ICEMAN)
+        defaultExtension = ".trace";
+
+    QString userTraceSavePath = mifare->getTraceSavePath();
+    if(userTraceSavePath.isEmpty())
+        clientTracePath = *clientWorkingDir;
+    else
+        clientTracePath = QDir(userTraceSavePath); // For v4.16717 and later
 
     title = tr("Plz select the location to save trace file:");
-    filename = QFileDialog::getSaveFileName(this, title, clientWorkingDir->absolutePath(), tr("Trace Files(*.trc)"));
+    filename = QFileDialog::getSaveFileName(this, title, clientTracePath.absolutePath(), tr("Trace Files") + "(*" + defaultExtension + ")");
     qDebug() << filename;
     if(filename != "")
     {
-        QString tmpFile = "tmp" + QString::number(QDateTime::currentDateTime().toTime_t()) + ".trc";
+        QString tmpFile = "tmp" + QString::number(QDateTime::currentDateTimeUtc().toTime_t()) + defaultExtension;
         mifare->saveSniff(tmpFile);
         for(int i = 0; i < 100; i++)
         {
             util->delay(100);
-            if(QFile::exists(clientWorkingDir->absolutePath() + "/" + tmpFile))
+            if(QFile::exists(clientTracePath.absolutePath() + "/" + tmpFile))
                 break;
         }
-        if(!QFile::copy(clientWorkingDir->absolutePath() + "/" + tmpFile, filename))
+        // filename is not empty -> the user has chosen to overwrite the existing file
+        if(QFile::exists(filename))
+            QFile::remove(filename);
+        if(!QFile::copy(clientTracePath.absolutePath() + "/" + tmpFile, filename))
         {
             QMessageBox::information(this, tr("Info"), tr("Failed to save to") + "\n" + filename);
         }
-        QFile::remove(clientWorkingDir->absolutePath() + "/" + tmpFile);
+        QFile::remove(clientTracePath.absolutePath() + "/" + tmpFile);
     }
 
 }