Firefox cannot load a directory content using file:///...

I'm currently using Firefox 3.6.12 on Windows server 2003 64 bits.
When browsing a smb share mounted on windows with an URL like:
file:///L:/dossiers_techniques/bugs/I18n_Ndmp/dir-utf8/Mus-%F0%9D%84%9E
(NB: it's displayed without the %xy stuff but using the appropriate font and glyph)
I simply obtain the following error page:
XML Parsing Error: reference to invalid character number
Location: file:///L:/dossiers_techniques/bugs/I18n_Ndmp/dir-utf8/Mus-%F0%9D%84%9E
Line Number 184, Column 76:<title>Index of file:///L:/dossiers_techniques/bugs/I18n_Ndmp/dir-utf8/Mus-&#xd834;&#xdd1e;</title>
---------------------------------------------------------------------------^
NB: I've crafted this folder and its content for I18N test purposes in the applications I'm working on.
And this specific Firefox test was triggered by a more complex configuration involving Flex and Java which thrown an exception (java.io.UTFDataFormatException).
As a matter of fact, using Firefox 3.0.8 running on linux, I can browse the same directory (shared and mounted through nfs) with just the small graphical issue that the single G CLEF glyph is displayed as two unknown glyphs:
Index of file:///usr/people/lps/dossiers_techniques/bugs/I18n_Ndmp/dir-utf8/Mus-��
I've uploaded the same "dir_utf8" content on a web server, (see URL given in the "URL of affected site" which is NOT affected): it works pretty find, if the character encoding is manually set to "Unicode (UTF-8)".
Hence it does seem that this issue is Windows or cifs or file: protocol related.

Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
* Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
"Remove Cookies" from sites causing problems:
* Tools > Options > Privacy > Cookies: "Show Cookies"
Start Firefox in [[Safe Mode]] to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode

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Firefox cannot load a directory content using file:///...

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