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#31
I meet the same issue.
The program doesn't list in open with window, and I can't add it to list by browsing the program. It because there was already a program with same filename in the registry, but the path of that registry record was wrong.
I solved it like this:
1. Enter Registry Editor.
2. Find the key, with the filename which u want to open with, under HKEY_CLASSES_ROOT\Applications.
3. Check the path in shell\open\commend of the key.