diff --git a/src/common/AnalTask.cpp b/src/common/AnalTask.cpp
index 81cfecd7..7a9fda27 100644
--- a/src/common/AnalTask.cpp
+++ b/src/common/AnalTask.cpp
@@ -19,8 +19,9 @@ void AnalTask::interrupt()
 QString AnalTask::getTitle()
 {
     // If no file is loaded we consider it's Initial Analysis
-    QJsonArray openedFiles = Core()->getOpenedFiles();
-    if (!openedFiles.size()) {
+    RzCoreLocked core(Core());
+    RzList *descs = rz_id_storage_list(core->io->files);
+    if (rz_list_empty(descs)) {
         return tr("Initial Analysis");
     }
     return tr("Analyzing Program");
@@ -38,8 +39,9 @@ void AnalTask::runTask()
     Core()->setConfig("bin.demangle", options.demangle);
 
     // Do not reload the file if already loaded
-    QJsonArray openedFiles = Core()->getOpenedFiles();
-    if (!openedFiles.size() && options.filename.length()) {
+    RzCoreLocked core(Core());
+    RzList *descs = rz_id_storage_list(core->io->files);
+    if (rz_list_empty(descs) && options.filename.length()) {
         log(tr("Loading the file..."));
         openFailed = false;
         bool fileLoaded =
diff --git a/src/core/Cutter.cpp b/src/core/Cutter.cpp
index 4f21288e..8791250c 100644
--- a/src/core/Cutter.cpp
+++ b/src/core/Cutter.cpp
@@ -386,11 +386,12 @@ bool CutterCore::isRedirectableDebugee()
     }
 
     // We are only able to redirect locally debugged unix processes
-    QJsonArray openFilesArray = cmdj("oj").array();
-    ;
-    for (QJsonValue value : openFilesArray) {
-        QJsonObject openFile = value.toObject();
-        QString URI = openFile["uri"].toString();
+    RzCoreLocked core(Core());
+    RzList *descs = rz_id_storage_list(core->io->files);
+    RzListIter *it;
+    RzIODesc *desc;
+    CutterRzListForeach(descs, it, RzIODesc, desc) {
+        QString URI = QString(desc->uri);
         if (URI.contains("ptrace") | URI.contains("mach")) {
             return true;
         }
@@ -1913,10 +1914,12 @@ void CutterCore::attachRemote(const QString &uri)
         debugTask.clear();
         // Check if we actually connected
         bool connected = false;
-        QJsonArray openFilesArray = getOpenedFiles();
-        for (QJsonValue value : openFilesArray) {
-            QJsonObject openFile = value.toObject();
-            QString fileUri = openFile["uri"].toString();
+        RzCoreLocked core(Core());
+        RzList *descs = rz_id_storage_list(core->io->files);
+        RzListIter *it;
+        RzIODesc *desc;
+        CutterRzListForeach(descs, it, RzIODesc, desc) {
+            QString fileUri = QString(desc->uri);
             if (!fileUri.compare(uri)) {
                 connected = true;
             }
@@ -2023,13 +2026,14 @@ void CutterCore::stopDebug()
     } else {
         QString ptraceFiles = "";
         // close ptrace file descriptors left open
-        QJsonArray openFilesArray = cmdj("oj").array();
-        ;
-        for (QJsonValue value : openFilesArray) {
-            QJsonObject openFile = value.toObject();
-            QString URI = openFile["uri"].toString();
+        RzCoreLocked core(Core());
+        RzList *descs = rz_id_storage_list(core->io->files);
+        RzListIter *it;
+        RzIODesc *desc;
+        CutterRzListForeach(descs, it, RzIODesc, desc) {
+            QString URI = QString(desc->uri);
             if (URI.contains("ptrace")) {
-                ptraceFiles += "o-" + QString::number(openFile["fd"].toInt()) + ";";
+                ptraceFiles += "o-" + QString::number(desc->fd) + ";";
             }
         }
         // Use cmd because cmdRaw would not work with command concatenation
@@ -4025,12 +4029,6 @@ QString CutterCore::getVersionInformation()
     return versionInfo;
 }
 
-QJsonArray CutterCore::getOpenedFiles()
-{
-    QJsonDocument files = cmdj("oj");
-    return files.array();
-}
-
 QList<QString> CutterCore::getColorThemes()
 {
     QList<QString> r;
diff --git a/src/core/Cutter.h b/src/core/Cutter.h
index 375943d1..cd382444 100644
--- a/src/core/Cutter.h
+++ b/src/core/Cutter.h
@@ -278,7 +278,6 @@ public:
     bool tryFile(QString path, bool rw);
     bool mapFile(QString path, RVA mapaddr);
     void loadScript(const QString &scriptname);
-    QJsonArray getOpenedFiles();
 
     /* Seek functions */
     void seek(QString thing);