--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -515,18 +515,13 @@ if os.name == 'nt':
 
     sys.stdout = winstdout(sys.stdout)
 
+    def system_rcpath():
+        return [r'c:\mercurial\mercurial.ini']
+
     def os_rcpath():
         '''return default os-specific hgrc search path'''
-        try:
-            import win32api, win32process
-            proc = win32api.GetCurrentProcess()
-            filename = win32process.GetModuleFileNameEx(proc, 0)
-            systemrc = os.path.join(os.path.dirname(filename), 'mercurial.ini')
-        except ImportError:
-            systemrc = r'c:\mercurial\mercurial.ini'
-
-        return [systemrc,
-                os.path.join(os.path.expanduser('~'), 'mercurial.ini')]
+        return system_rcpath() + [os.path.join(os.path.expanduser('~'),
+                                               'mercurial.ini')]
 
     def parse_patch_output(output_line):
         """parses the output produced by patch and returns the file name"""
@@ -535,43 +530,9 @@ if os.name == 'nt':
             pf = pf[1:-1] # Remove the quotes
         return pf
 
-    try: # Mark Hammond's win32all package allows better functionality on Windows
-        import win32api, win32con, win32file, pywintypes
-
-        # create hard links using win32file module
-        def os_link(src, dst): # NB will only succeed on NTFS
-            win32file.CreateHardLink(dst, src)
-
-        def nlinks(pathname):
-            """Return number of hardlinks for the given file."""
-            try:
-                fh = win32file.CreateFile(pathname,
-                    win32file.GENERIC_READ, win32file.FILE_SHARE_READ,
-                    None, win32file.OPEN_EXISTING, 0, None)
-                res = win32file.GetFileInformationByHandle(fh)
-                fh.Close()
-                return res[7]
-            except:
-                return os.stat(pathname).st_nlink
-
-        def testpid(pid):
-            '''return True if pid is still running or unable to
-            determine, False otherwise'''
-            try:
-                import win32process, winerror
-                handle = win32api.OpenProcess(
-                    win32con.PROCESS_QUERY_INFORMATION, False, pid)
-                if handle:
-                    status = win32process.GetExitCodeProcess(handle)
-                    return status == win32con.STILL_ACTIVE
-            except pywintypes.error, details:
-                return details[0] != winerror.ERROR_INVALID_PARAMETER
-            return True
-
-    except ImportError:
-        def testpid(pid):
-            '''return False if pid dead, True if running or not known'''
-            return True
+    def testpid(pid):
+        '''return False if pid dead, True if running or not known'''
+        return True
 
     def is_exec(f, last):
         return last
@@ -597,6 +558,12 @@ if os.name == 'nt':
     def explain_exit(code):
         return _("exited with status %d") % code, code
 
+    try:
+        # override functions with win32 versions if possible
+        from util_win32 import *
+    except ImportError:
+        pass
+
 else:
     nulldev = '/dev/null'
 

new file mode 100644
--- /dev/null
+++ b/mercurial/util_win32.py
@@ -0,0 +1,171 @@
+# util_win32.py - utility functions that use win32 API
+#
+# Copyright 2005 Matt Mackall <mpm@selenic.com>
+# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
+#
+# This software may be used and distributed according to the terms of
+# the GNU General Public License, incorporated herein by reference.
+
+# Mark Hammond's win32all package allows better functionality on
+# Windows.  this module overrides definitions in util.py.  if not
+# available, import of this module will fail, and generic code will be
+# used.
+
+import win32api
+
+from demandload import *
+from i18n import gettext as _
+demandload(globals(), 'errno os pywintypes win32con win32file win32process')
+demandload(globals(), 'winerror')
+
+class WinError(OSError):
+    winerror_map = {
+        winerror.ERROR_ACCESS_DENIED: errno.EACCES,
+        winerror.ERROR_ACCOUNT_DISABLED: errno.EACCES,
+        winerror.ERROR_ACCOUNT_RESTRICTION: errno.EACCES,
+        winerror.ERROR_ALREADY_ASSIGNED: errno.EBUSY,
+        winerror.ERROR_ALREADY_EXISTS: errno.EEXIST,
+        winerror.ERROR_ARITHMETIC_OVERFLOW: errno.ERANGE,
+        winerror.ERROR_BAD_COMMAND: errno.EIO,
+        winerror.ERROR_BAD_DEVICE: errno.ENODEV,
+        winerror.ERROR_BAD_DRIVER_LEVEL: errno.ENXIO,
+        winerror.ERROR_BAD_EXE_FORMAT: errno.ENOEXEC,
+        winerror.ERROR_BAD_FORMAT: errno.ENOEXEC,
+        winerror.ERROR_BAD_LENGTH: errno.EINVAL,
+        winerror.ERROR_BAD_PATHNAME: errno.ENOENT,
+        winerror.ERROR_BAD_PIPE: errno.EPIPE,
+        winerror.ERROR_BAD_UNIT: errno.ENODEV,
+        winerror.ERROR_BAD_USERNAME: errno.EINVAL,
+        winerror.ERROR_BROKEN_PIPE: errno.EPIPE,
+        winerror.ERROR_BUFFER_OVERFLOW: errno.ENAMETOOLONG,
+        winerror.ERROR_BUSY: errno.EBUSY,
+        winerror.ERROR_BUSY_DRIVE: errno.EBUSY,
+        winerror.ERROR_CALL_NOT_IMPLEMENTED: errno.ENOSYS,
+        winerror.ERROR_CANNOT_MAKE: errno.EACCES,
+        winerror.ERROR_CANTOPEN: errno.EIO,
+        winerror.ERROR_CANTREAD: errno.EIO,
+        winerror.ERROR_CANTWRITE: errno.EIO,
+        winerror.ERROR_CRC: errno.EIO,
+        winerror.ERROR_CURRENT_DIRECTORY: errno.EACCES,
+        winerror.ERROR_DEVICE_IN_USE: errno.EBUSY,
+        winerror.ERROR_DEV_NOT_EXIST: errno.ENODEV,
+        winerror.ERROR_DIRECTORY: errno.EINVAL,
+        winerror.ERROR_DIR_NOT_EMPTY: errno.ENOTEMPTY,
+        winerror.ERROR_DISK_CHANGE: errno.EIO,
+        winerror.ERROR_DISK_FULL: errno.ENOSPC,
+        winerror.ERROR_DRIVE_LOCKED: errno.EBUSY,
+        winerror.ERROR_ENVVAR_NOT_FOUND: errno.EINVAL,
+        winerror.ERROR_EXE_MARKED_INVALID: errno.ENOEXEC,
+        winerror.ERROR_FILENAME_EXCED_RANGE: errno.ENAMETOOLONG,
+        winerror.ERROR_FILE_EXISTS: errno.EEXIST,
+        winerror.ERROR_FILE_INVALID: errno.ENODEV,
+        winerror.ERROR_FILE_NOT_FOUND: errno.ENOENT,
+        winerror.ERROR_GEN_FAILURE: errno.EIO,
+        winerror.ERROR_HANDLE_DISK_FULL: errno.ENOSPC,
+        winerror.ERROR_INSUFFICIENT_BUFFER: errno.ENOMEM,
+        winerror.ERROR_INVALID_ACCESS: errno.EACCES,
+        winerror.ERROR_INVALID_ADDRESS: errno.EFAULT,
+        winerror.ERROR_INVALID_BLOCK: errno.EFAULT,
+        winerror.ERROR_INVALID_DATA: errno.EINVAL,
+        winerror.ERROR_INVALID_DRIVE: errno.ENODEV,
+        winerror.ERROR_INVALID_EXE_SIGNATURE: errno.ENOEXEC,
+        winerror.ERROR_INVALID_FLAGS: errno.EINVAL,
+        winerror.ERROR_INVALID_FUNCTION: errno.ENOSYS,
+        winerror.ERROR_INVALID_HANDLE: errno.EBADF,
+        winerror.ERROR_INVALID_LOGON_HOURS: errno.EACCES,
+        winerror.ERROR_INVALID_NAME: errno.EINVAL,
+        winerror.ERROR_INVALID_OWNER: errno.EINVAL,
+        winerror.ERROR_INVALID_PARAMETER: errno.EINVAL,
+        winerror.ERROR_INVALID_PASSWORD: errno.EPERM,
+        winerror.ERROR_INVALID_PRIMARY_GROUP: errno.EINVAL,
+        winerror.ERROR_INVALID_SIGNAL_NUMBER: errno.EINVAL,
+        winerror.ERROR_INVALID_TARGET_HANDLE: errno.EIO,
+        winerror.ERROR_INVALID_WORKSTATION: errno.EACCES,
+        winerror.ERROR_IO_DEVICE: errno.EIO,
+        winerror.ERROR_IO_INCOMPLETE: errno.EINTR,
+        winerror.ERROR_LOCKED: errno.EBUSY,
+        winerror.ERROR_LOCK_VIOLATION: errno.EACCES,
+        winerror.ERROR_LOGON_FAILURE: errno.EACCES,
+        winerror.ERROR_MAPPED_ALIGNMENT: errno.EINVAL,
+        winerror.ERROR_META_EXPANSION_TOO_LONG: errno.E2BIG,
+        winerror.ERROR_MORE_DATA: errno.EPIPE,
+        winerror.ERROR_NEGATIVE_SEEK: errno.ESPIPE,
+        winerror.ERROR_NOACCESS: errno.EFAULT,
+        winerror.ERROR_NONE_MAPPED: errno.EINVAL,
+        winerror.ERROR_NOT_ENOUGH_MEMORY: errno.ENOMEM,
+        winerror.ERROR_NOT_READY: errno.EAGAIN,
+        winerror.ERROR_NOT_SAME_DEVICE: errno.EXDEV,
+        winerror.ERROR_NO_DATA: errno.EPIPE,
+        winerror.ERROR_NO_MORE_SEARCH_HANDLES: errno.EIO,
+        winerror.ERROR_NO_PROC_SLOTS: errno.EAGAIN,
+        winerror.ERROR_NO_SUCH_PRIVILEGE: errno.EACCES,
+        winerror.ERROR_OPEN_FAILED: errno.EIO,
+        winerror.ERROR_OPEN_FILES: errno.EBUSY,
+        winerror.ERROR_OPERATION_ABORTED: errno.EINTR,
+        winerror.ERROR_OUTOFMEMORY: errno.ENOMEM,
+        winerror.ERROR_PASSWORD_EXPIRED: errno.EACCES,
+        winerror.ERROR_PATH_BUSY: errno.EBUSY,
+        winerror.ERROR_PATH_NOT_FOUND: errno.ENOTDIR,
+        winerror.ERROR_PIPE_BUSY: errno.EBUSY,
+        winerror.ERROR_PIPE_CONNECTED: errno.EPIPE,
+        winerror.ERROR_PIPE_LISTENING: errno.EPIPE,
+        winerror.ERROR_PIPE_NOT_CONNECTED: errno.EPIPE,
+        winerror.ERROR_PRIVILEGE_NOT_HELD: errno.EACCES,
+        winerror.ERROR_READ_FAULT: errno.EIO,
+        winerror.ERROR_SEEK: errno.EIO,
+        winerror.ERROR_SEEK_ON_DEVICE: errno.ESPIPE,
+        winerror.ERROR_SHARING_BUFFER_EXCEEDED: errno.ENFILE,
+        winerror.ERROR_SHARING_VIOLATION: errno.EACCES,
+        winerror.ERROR_STACK_OVERFLOW: errno.ENOMEM,
+        winerror.ERROR_SWAPERROR: errno.ENOENT,
+        winerror.ERROR_TOO_MANY_MODULES: errno.EMFILE,
+        winerror.ERROR_TOO_MANY_OPEN_FILES: errno.EMFILE,
+        winerror.ERROR_UNRECOGNIZED_MEDIA: errno.ENXIO,
+        winerror.ERROR_UNRECOGNIZED_VOLUME: errno.ENODEV,
+        winerror.ERROR_WAIT_NO_CHILDREN: errno.ECHILD,
+        winerror.ERROR_WRITE_FAULT: errno.EIO,
+        winerror.ERROR_WRITE_PROTECT: errno.EROFS,
+        }
+
+    def __init__(self, err):
+        self.win_errno, self.win_function, self.win_strerror = err
+        OSError.__init__(self, self.winerror_map.get(self.win_errno, 0),
+                         self.win_strerror)
+
+def os_link(src, dst):
+    # NB will only succeed on NTFS
+    try:
+        win32file.CreateHardLink(dst, src)
+    except pywintypes.error, details:
+        raise WinError(details)
+
+def nlinks(pathname):
+    """Return number of hardlinks for the given file."""
+    try:
+        fh = win32file.CreateFile(pathname,
+            win32file.GENERIC_READ, win32file.FILE_SHARE_READ,
+            None, win32file.OPEN_EXISTING, 0, None)
+        res = win32file.GetFileInformationByHandle(fh)
+        fh.Close()
+        return res[7]
+    except pywintypes.error:
+        return os.stat(pathname).st_nlink
+
+def testpid(pid):
+    '''return True if pid is still running or unable to
+    determine, False otherwise'''
+    try:
+        handle = win32api.OpenProcess(
+            win32con.PROCESS_QUERY_INFORMATION, False, pid)
+        if handle:
+            status = win32process.GetExitCodeProcess(handle)
+            return status == win32con.STILL_ACTIVE
+    except pywintypes.error, details:
+        return details[0] != winerror.ERROR_INVALID_PARAMETER
+    return True
+
+def system_rcpath():
+    '''return default os-specific hgrc search path'''
+    proc = win32api.GetCurrentProcess()
+    filename = win32process.GetModuleFileNameEx(proc, 0)
+    return [os.path.join(os.path.dirname(filename), 'mercurial.ini')]