6 files changed, 99 insertions, 3 deletions
diff --git a/api/gui/icons/MMCIcon.cpp b/api/gui/icons/MMCIcon.cpp
index 2a2d6e6f..5058717a 100644
--- a/api/gui/icons/MMCIcon.cpp
+++ b/api/gui/icons/MMCIcon.cpp
@@ -102,3 +102,17 @@ void MMCIcon::replace(IconType new_type, const QString& key)
     m_images[new_type].filename = QString();
     m_images[new_type].key = key;
 }
+
+QString MMCIcon::getFilePath() const
+{
+    if(m_current_type == IconType::ToBeDeleted){
+        return QString();
+    }
+    return m_images[m_current_type].filename;
+}
+
+
+bool MMCIcon::isBuiltIn() const
+{
+    return m_current_type == IconType::Builtin;
+}
diff --git a/api/gui/icons/MMCIcon.h b/api/gui/icons/MMCIcon.h
index c0eb5570..9fd1b9a2 100644
--- a/api/gui/icons/MMCIcon.h
+++ b/api/gui/icons/MMCIcon.h
@@ -46,4 +46,6 @@ struct MULTIMC_GUI_EXPORT MMCIcon
     void remove(IconType rm_type);
     void replace(IconType new_type, QIcon icon, QString path = QString());
     void replace(IconType new_type, const QString &key);
+    bool isBuiltIn() const;
+    QString getFilePath() const;
 };
diff --git a/api/logic/CMakeLists.txt b/api/logic/CMakeLists.txt
index 39850163..94da2682 100644
--- a/api/logic/CMakeLists.txt
+++ b/api/logic/CMakeLists.txt
@@ -182,9 +182,11 @@ set(NEWS_SOURCES
 
 # Icon interface
 set(ICONS_SOURCES
-    # News System
+    # Icons System and related code
     icons/IIconList.h
     icons/IIconList.cpp
+    icons/IconUtils.h
+    icons/IconUtils.cpp
 )
 
 # Minecraft services status checker
diff --git a/api/logic/InstanceImportTask.cpp b/api/logic/InstanceImportTask.cpp
index bbab557a..1e93174c 100644
--- a/api/logic/InstanceImportTask.cpp
+++ b/api/logic/InstanceImportTask.cpp
@@ -6,6 +6,7 @@
 #include "NullInstance.h"
 #include "settings/INISettingsObject.h"
 #include "icons/IIconList.h"
+#include "icons/IconUtils.h"
 #include <QtConcurrentRun>
 
 // FIXME: this does not belong here, it's Minecraft/Flame specific
@@ -393,8 +394,9 @@ void InstanceImportTask::processMultiMC()
     else
     {
         m_instIcon = instance.iconKey();
-        auto importIconPath = FS::PathCombine(instance.instanceRoot(), m_instIcon + ".png");
-        if (QFile::exists(importIconPath))
+
+        auto importIconPath = IconUtils::findBestIconIn(instance.instanceRoot(), m_instIcon);
+        if (!importIconPath.isNull() && QFile::exists(importIconPath))
         {
             // import icon
             auto iconList = ENV.icons();
diff --git a/api/logic/icons/IconUtils.cpp b/api/logic/icons/IconUtils.cpp
new file mode 100644
index 00000000..1b6d7553
--- /dev/null
+++ b/api/logic/icons/IconUtils.cpp
@@ -0,0 +1,62 @@
+#include "IconUtils.h"
+
+#include "FileSystem.h"
+#include <QDirIterator>
+
+#include <array>
+
+namespace {
+std::array<const char *, 6> validIconExtensions = {
+    "svg",
+    "png",
+    "ico",
+    "gif",
+    "jpg",
+    "jpeg"
+};
+}
+
+namespace IconUtils{
+
+QString findBestIconIn(const QString &folder, const QString & iconKey) {
+    int best_found = validIconExtensions.size();
+    QString best_filename;
+
+    QDirIterator it(folder, QDir::NoDotAndDotDot | QDir::Files, QDirIterator::NoIteratorFlags);
+    while (it.hasNext()) {
+        it.next();
+        auto fileInfo = it.fileInfo();
+
+        if(fileInfo.completeBaseName() != iconKey)
+            continue;
+
+        auto extension = fileInfo.suffix();
+
+        for(int i = 0; i < best_found; i++) {
+            if(extension == validIconExtensions[i]) {
+                best_found = i;
+                qDebug() << i << " : " << fileInfo.fileName();
+                best_filename = fileInfo.fileName();
+            }
+        }
+    }
+    return FS::PathCombine(folder, best_filename);
+}
+
+QString getIconFilter() {
+    QString out;
+    QTextStream stream(&out);
+    stream << '(';
+    for(size_t i = 0; i < validIconExtensions.size() - 1; i++) {
+        if(i > 0) {
+            stream << " ";
+        }
+        stream << "*." << validIconExtensions[i];
+    }
+    stream << " *." << validIconExtensions[validIconExtensions.size() - 1];
+    stream << ')';
+    return out;
+}
+
+}
+
diff --git a/api/logic/icons/IconUtils.h b/api/logic/icons/IconUtils.h
new file mode 100644
index 00000000..ce236946
--- /dev/null
+++ b/api/logic/icons/IconUtils.h
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <QString>
+#include "multimc_logic_export.h"
+
+namespace IconUtils {
+
+// Given a folder and an icon key, find 'best' of the icons with the given key in there and return its path
+MULTIMC_LOGIC_EXPORT QString findBestIconIn(const QString &folder, const QString & iconKey);
+
+// Get icon file type filter for file browser dialogs
+MULTIMC_LOGIC_EXPORT QString getIconFilter();
+
+}