diff --git a/maldump/__main__.py b/maldump/__main__.py
index 228df84..7a9e761 100755
--- a/maldump/__main__.py
+++ b/maldump/__main__.py
@@ -48,8 +48,8 @@ def main() -> None:
         'Working in directory "%s", files would be stored into "%s"', os.getcwd(), dest
     )
 
-    # Get a list of all installed avs
-    avs = AVManager.detect()
+    # Get a list of all supported or all installed avs
+    avs = AVManager.detect() if args.detect_avs else AVManager.retrieve()
 
     logger.debug("Detected AVs: %s", [av.name for av in avs])
 
@@ -169,6 +169,12 @@ def parse_cli() -> argparse.Namespace:
     parser.add_argument(
         "-a", "--all", action="store_true", help="equivalent of running both -q and -m"
     )
+    parser.add_argument(
+        "-c",
+        "--detect-avs",
+        action="store_false",
+        help="try only avs which were detected in the system",
+    )
     parser.add_argument(
         "-t",
         "--log-level",
diff --git a/maldump/av_manager.py b/maldump/av_manager.py
index c7047ae..ca133f1 100755
--- a/maldump/av_manager.py
+++ b/maldump/av_manager.py
@@ -39,3 +39,8 @@ class AVManager:
     def detect(cls) -> list[Quarantine]:
         """Returns a list of avs installed on the system"""
         return [av for av in cls.avs if av.location.exists()]
+
+    @classmethod
+    def retrieve(cls) -> list[Quarantine]:
+        """Returns a list of all supported avs"""
+        return cls.avs
diff --git a/maldump/parsers/avast_parser.py b/maldump/parsers/avast_parser.py
index 3013ed0..1aed838 100644
--- a/maldump/parsers/avast_parser.py
+++ b/maldump/parsers/avast_parser.py
@@ -29,8 +29,21 @@ def __init__(self):
     @log.log(lgr=logger)
     def __del__(self):
         if hasattr(self, "db"):
-            self.db.close()
-            unlink(self.tmpfile)
+            logger.debug(
+                "Deleting parser object, closing database file, unlinking tmp file"
+            )
+
+            if self.db is not None:
+                self.db.close()
+
+            try:
+                logger.debug('Trying to delete temporary file "%s"', self.tmpfile)
+                if self.tmpfile is not None:
+                    unlink(self.tmpfile)
+            except OSError as e:
+                logger.exception(
+                    'Cannot unlink temporary file "%s"', self.tmpfile, exc_info=e
+                )
 
     @log.log(lgr=logger)
     def _initDB(self) -> bool:
@@ -40,7 +53,7 @@ def _initDB(self) -> bool:
                 'Trying to parse index.xml file "%s"', self.location / "index.xml"
             )
             self.root = ET.parse(self.location / "index.xml").getroot()
-        except ParseError as e:
+        except (ParseError, OSError) as e:
             logger.exception("Cannot open and parse index.xml", exc_info=e)
             return False
 
diff --git a/maldump/parsers/avg_parser.py b/maldump/parsers/avg_parser.py
index 06415d6..bb7ab53 100644
--- a/maldump/parsers/avg_parser.py
+++ b/maldump/parsers/avg_parser.py
@@ -29,8 +29,21 @@ def __init__(self):
     @log.log(lgr=logger)
     def __del__(self):
         if hasattr(self, "db"):
-            self.db.close()
-            unlink(self.tmpfile)
+            logger.debug(
+                "Deleting parser object, closing database file, unlinking tmp file"
+            )
+
+            if self.db is not None:
+                self.db.close()
+
+            try:
+                logger.debug('Trying to delete temporary file "%s"', self.tmpfile)
+                if self.tmpfile is not None:
+                    unlink(self.tmpfile)
+            except OSError as e:
+                logger.exception(
+                    'Cannot unlink temporary file "%s"', self.tmpfile, exc_info=e
+                )
 
     @log.log(lgr=logger)
     def _initDB(self) -> bool:
@@ -40,7 +53,7 @@ def _initDB(self) -> bool:
                 'Trying to parse index.xml file "%s"', self.location / "index.xml"
             )
             self.root = ET.parse(self.location / "index.xml").getroot()
-        except ParseError as e:
+        except (ParseError, OSError) as e:
             logger.exception("Cannot open and parse index.xml", exc_info=e)
             return False