It fixes icat/tango-metadata#12

src/main/python/MetadataManager/MetadataManager.py

@@ -302,7 +302,7 @@ class MetadataManager (PyTango.Device_4Impl):
         self.debug_stream("In read_metadataFile()")
         #----- PROTECTED REGION ID(MetadataManager.metadataFile_read) ENABLED START -----#
         if self.attr_metadataFile_read :
-            attr.set_value(self.Sanitize(self.attr_metadataFile_read))
+            attr.set_value(self.metadataWorker.Sanitize(self.attr_metadataFile_read))
         else :
             attr.set_value(self.DefaultFileName())
         #----- PROTECTED REGION END -----#	//	MetadataManager.metadataFile_read

src/main/python/MetadataManager/MetadataWorker.py

@@ -37,7 +37,7 @@ class MetadataWorker():
     '''
     LOG = logging.getLogger("MetadataWorker")
     # Allowed chars for folder and file names
-    validFilenameChars = "-_%s%s" % (string.ascii_letters, string.digits)
+    validFilenameChars = ".-_%s%s" % (string.ascii_letters, string.digits)
 
 
     def __init__(self):