Path and Unicode woes

[André]

I'm attempting to override a wxHtmlWindow method in order to
pre-process the file before displaying it. I'm using a unicode version
of wxPython.  I don't think my problem are wxPython-specific, but
rather a unicode mis-understanding.   Consider the following:

.    def OnLinkClicked(self, linkinfo):
.        #adapted from the wxPython demo
.        target_file = linkinfo.GetHref()
.        current = self.GetOpenedPage()
.        path = os.path.dirname(current)
.        print "path = ", path
.        print "current = ", current
.        print "target_file = ", target_file
.        filename = os.path.join(path, target_file)
.        print "filename = ", filename
.        filename = filename.replace('\\','/')
.        print "filename: ", filename+'\n'
.        self.LoadFile(filename)

The first time I *click* on a link, I get the following:


path =  E:/Copy of rurple0.9.0.1b/rurple0.9.0.1/html/en
current =  E:/Copy of rurple0.9.0.1b/rurple0.9.0.1/html/en/rur.htm.html
target_file =  intro/browser.htm
filename =  E:/Copy of
rurple0.9.0.1b/rurple0.9.0.1/html/en\intro/browser.htm
filename:  E:/Copy of
rurple0.9.0.1b/rurple0.9.0.1/html/en/intro/browser.htm

... and everything is just fine (the expected file opens in the browser
window).  The second time I *click* on a link, I get the following
(note the replacement of "E:" by "/E%3A"):

path =  /E%3A/Copy of rurple0.9.0.1b/rurple0.9.0.1/html/en/intro
current =  /E%3A/Copy of
rurple0.9.0.1b/rurple0.9.0.1/html/en/intro/browser.htm.html
target_file =  explore.htm
filename =  /E%3A/Copy of
rurple0.9.0.1b/rurple0.9.0.1/html/en/intro\explore.htm
filename:  /E%3A/Copy of
rurple0.9.0.1b/rurple0.9.0.1/html/en/intro/explore.htm

Traceback (most recent call last):
  File "E:\Copy of rurple0.9.0.1b\rurple0.9.0.1\rur_py\browser.py",
line 77, in OnLinkClicked
    self.LoadFile(filename)
  File "E:\Copy of rurple0.9.0.1b\rurple0.9.0.1\rur_py\browser.py",
line 54, in LoadFile
    data = open(filename, 'r').read()
IOError: [Errno 2] No such file or directory: u'/E%3A/Copy of
rurple0.9.0.1b/rurple0.9.0.1/html/en/intro/explore.htm'

Any help or pointers would be appreciated...

André