--- a/hgext/mq.py	Thu Mar 04 14:23:54 2010 +0100
+++ b/hgext/mq.py	Fri Mar 05 10:49:56 2010 +0100
@@ -813,8 +813,7 @@
     _reserved = ('series', 'status', 'guards')
     def check_reserved_name(self, name):
         if (name in self._reserved or name.startswith('.hg')
-            or name.startswith('.mq') or '#' in name
-            or (os.name == 'nt' and ':' in name)):
+            or name.startswith('.mq') or '#' in name or ':' in name):
             raise util.Abort(_('"%s" cannot be used as the name of a patch')
                              % name)
 

--- a/tests/test-mq-qnew	Thu Mar 04 14:23:54 2010 +0100
+++ b/tests/test-mq-qnew	Fri Mar 05 10:49:56 2010 +0100
@@ -21,6 +21,7 @@
     hg qnew .hgignore
     hg qnew .mqfoo
     hg qnew 'foo#bar'
+    hg qnew 'foo:bar'
 
     hg qinit -c
 

--- a/tests/test-mq-qnew.out	Thu Mar 04 14:23:54 2010 +0100
+++ b/tests/test-mq-qnew.out	Fri Mar 05 10:49:56 2010 +0100
@@ -7,6 +7,7 @@
 abort: ".hgignore" cannot be used as the name of a patch
 abort: ".mqfoo" cannot be used as the name of a patch
 abort: "foo#bar" cannot be used as the name of a patch
+abort: "foo:bar" cannot be used as the name of a patch
 % qnew with uncommitted changes
 uncommitted.patch
 % qnew implies add