User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3 When I try to open a file by double clicking it in Windows Explorer Firefox tells me that: File not found Firefox can't find the file at /D:/???.htm. the name of the file is: "تست.htm" The URL bar show: "file:///D:/%3F%3F%3F.htm" but when I correct the path in the URL bar or when I use the Open dialogue it opens the file and shows the correct URL which is: "file:///D:/%D8%AA%D8%B3%D8%AA.htm" BTW IE opens it correctly. Reproducible: Always Steps to Reproduce: 1. create a file with non-English name. (in my case Persian) 2. double click the file in Windows Explorer. Actual Results: FF won't open the file. Expected Results: It should have opened the file.

more info: 1. an English named file in a path that contains a non-English directory also does not open. The URL bar shows this: "file:///D:/%3F%3F%3F/test.htm" 2. Windows does not allow "?" to be in the name of files and folders.