diff --git a/cockatrice/src/carddatabase.cpp b/cockatrice/src/carddatabase.cpp
index 2e5c0ec7..5a942b0f 100644
--- a/cockatrice/src/carddatabase.cpp
+++ b/cockatrice/src/carddatabase.cpp
@@ -16,12 +16,6 @@
 
 const int CardDatabase::versionNeeded = 3;
 
-CardSet::CardSet(const QString &_shortName, const QString &_longName)
-    : shortName(_shortName), longName(_longName)
-{
-    updateSortKey();
-}
-
 QXmlStreamWriter &operator<<(QXmlStreamWriter &xml, const CardSet *set)
 {
     xml.writeStartElement("set");
@@ -32,6 +26,24 @@ QXmlStreamWriter &operator<<(QXmlStreamWriter &xml, const CardSet *set)
     return xml;
 }
 
+CardSet::CardSet(const QString &_shortName, const QString &_longName)
+    : shortName(_shortName), longName(_longName)
+{
+    updateSortKey();
+}
+
+QString CardSet::getCorrectedShortName() const
+{
+    // Because windows is horrible.
+    QSet<QString> invalidFileNames;
+    invalidFileNames << "CON" << "PRN" << "AUX" << "NUL" << "COM1" << "COM2" <<
+        "COM3" << "COM4" << "COM5" << "COM6" << "COM7" << "COM8" << "COM9" <<
+        "LPT1" << "LPT2" << "LPT3" << "LPT4" << "LPT5" << "LPT6" << "LPT7" <<
+        "LPT8" << "LPT9";
+
+    return invalidFileNames.contains(shortName) ? shortName + "_" : shortName;
+}
+
 void CardSet::setSortKey(unsigned int _sortKey)
 {
     sortKey = _sortKey;
diff --git a/cockatrice/src/carddatabase.h b/cockatrice/src/carddatabase.h
index 5e83080c..70d77bca 100644
--- a/cockatrice/src/carddatabase.h
+++ b/cockatrice/src/carddatabase.h
@@ -26,6 +26,7 @@ private:
     unsigned int sortKey;
 public:
     CardSet(const QString &_shortName = QString(), const QString &_longName = QString());
+    QString getCorrectedShortName() const;
     QString getShortName() const { return shortName; }
     QString getLongName() const { return longName; }
     int getSortKey() const { return sortKey; }
@@ -51,7 +52,7 @@ public:
     PictureToLoad(CardInfo *_card = 0, bool _stripped = false, bool _hq = true);
     CardInfo *getCard() const { return card; }
     bool getStripped() const { return stripped; }
-    QString getSetName() const { return sortedSets[setIndex]->getShortName(); }
+    QString getSetName() const { return sortedSets[setIndex]->getCorrectedShortName(); }
     bool nextSet();
     bool getHq() const { return hq; }
     void setHq(bool _hq) { hq = _hq; }