diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -6,7 +6,7 @@
 # of the GNU General Public License, incorporated herein by reference.
 
 import os, re, sys, signal
-import fancyopts, ui, hg
+import fancyopts, ui, hg, util
 from demandload import *
 demandload(globals(), "mdiff time hgweb traceback random signal errno")
 
@@ -16,20 +16,20 @@ def filterfiles(filters, files):
     l = [ x for x in files if x in filters ]
 
     for t in filters:
-        if t and t[-1] != os.sep: t += os.sep
+        if t and t[-1] != "/": t += "/"
         l += [ x for x in files if x.startswith(t) ]
     return l
 
 def relfilter(repo, files):
     if os.getcwd() != repo.root:
         p = os.getcwd()[len(repo.root) + 1: ]
-        return filterfiles([p], files)
+        return filterfiles([util.pconvert(p)], files)
     return files
 
 def relpath(repo, args):
     if os.getcwd() != repo.root:
         p = os.getcwd()[len(repo.root) + 1: ]
-        return [ os.path.normpath(os.path.join(p, x)) for x in args ]
+        return [ util.pconvert(os.path.normpath(os.path.join(p, x))) for x in args ]
     return args
 
 def dodiff(ui, repo, path, files = None, node1 = None, node2 = None):
diff --git a/mercurial/hg.py b/mercurial/hg.py
--- a/mercurial/hg.py
+++ b/mercurial/hg.py
@@ -6,6 +6,7 @@
 # of the GNU General Public License, incorporated herein by reference.
 
 import sys, struct, os
+import util
 from revlog import *
 from demandload import *
 demandload(globals(), "re lock urllib urllib2 transaction time socket")
@@ -389,7 +390,7 @@ class localrepository:
                 l = file(self.wjoin(".hgignore"))
                 for pat in l:
                     if pat != "\n":
-                        self.ignorelist.append(re.compile(pat[:-1]))
+                        self.ignorelist.append(re.compile(util.pconvert(pat[:-1])))
             except IOError: pass
         for pat in self.ignorelist:
             if pat.search(f): return True
@@ -639,7 +640,7 @@ class localrepository:
             if ".hg" in subdirs: subdirs.remove(".hg")
             
             for f in files:
-                fn = os.path.join(d, f)
+                fn = util.pconvert(os.path.join(d, f))
                 try: s = os.stat(os.path.join(self.root, fn))
                 except: continue
                 if fn in dc:
diff --git a/mercurial/util.py b/mercurial/util.py
new file mode 100644
--- /dev/null
+++ b/mercurial/util.py
@@ -0,0 +1,16 @@
+# util.py - utility functions and platform specfic implementations
+#
+# Copyright 2005 K. Thananchayan <thananck@yahoo.com>
+#
+# This software may be used and distributed according to the terms
+# of the GNU General Public License, incorporated herein by reference.
+
+import os
+
+if os.name == 'nt':
+    def pconvert(path):
+        return path.replace("\\", "/")
+else:
+    def pconvert(path):
+        return path
+