Index: translate/storage/factory.py
===================================================================
--- translate/storage/factory.py	(revision 7740)
+++ translate/storage/factory.py	(working copy)
@@ -184,3 +184,21 @@
         store = storeclass()
     return store
 
+def supported_files():
+    """Returns data about all supported files
+
+    @return: list of type that include (name, extension, mimetypes)
+    @rtype: list
+    """
+
+    supported = []
+    processed = []
+    for supported_class in classes.itervalues():
+        name = getattr(supported_class, "name", None)
+        if name is None or name in processed:
+            continue
+        processed.append(name)
+        extension = getattr(supported_class, "extension", None)
+        mimetype = getattr(supported_class, "mimetype", None)
+        supported.extend([(name, extension, mimetype)])
+    return supported
Index: translate/storage/mo.py
===================================================================
--- translate/storage/mo.py	(revision 7740)
+++ translate/storage/mo.py	(working copy)
@@ -101,6 +101,9 @@
 class mofile(base.TranslationStore):
     """A class representing a .mo file."""
     UnitClass = mounit
+    name = "Gettext MO file"
+    extension = ("*.mo", "*.gmo")
+    mimetype = ("application/x-gettext-catalog", )
     def __init__(self, inputfile=None, unitclass=mounit):
         self.UnitClass = unitclass
         base.TranslationStore.__init__(self, unitclass=unitclass)
Index: translate/storage/pocommon.py
===================================================================
--- translate/storage/pocommon.py	(revision 7740)
+++ translate/storage/pocommon.py	(working copy)
@@ -63,6 +63,10 @@
 
 class pofile(base.TranslationStore, poheader.poheader):
 
+    name = "Gettext PO file"
+    extension = ("*.po", "*.pot")
+    mimetype = ("application/x-gettext-catalog", )
+
     def makeheader(self, **kwargs):
         """create a header for the given filename. arguments are specially handled, kwargs added as key: value
         pot_creation_date can be None (current date) or a value (datetime or string)