vlc default for mkv still open with window always

[Spanky]

Don't know if it is okay to post this question here but as I'm having Windows Xp Computer on which problem is so.
From the start I made VLC a default player for .mkv files & everything was going ok but from some time there is no file icon to .mkv files & double clicking .mkv files always opens "Open With" window even if I clicked on always open with this in that window, it still opens up open with. there is that icon for all .mkv files that we get for no extension files.
please help.

[TypX]

You should be able to reassociate mkvs to vlc using Tools->Preferences and then use the association menu that should be at the bottom of the interface thumbnail. (Or the "open with" should allow you to use always the same software by clicking a checkbox).

[Spanky]

I already did all of it but still no luck because even after setting it default to all media & all .mkv files shows that the vlc player is default for them in the properties of the file but still no vlc icon on that file & there is always "Open with" window. The properties of the files says:
Type of File: VLC Media File (.mkv)
Opens with: VLC Media Player 2.0.5
& still it opens the file with "Open with" window every time. I even tried un/install, still no luck.

[TypX]

It's only on one file? If so maybe it lacks an extension and windows hides it (somewhere in the windows properties) and just renaming it to "add extension" won't do much.