How to show MTS files in windows explorer and free play MTS on Windows 7?
Tutorial: 
"How to default to open on a selected directory with Windows Explorer ?"
"AVCHD (.MTS/.MT2S) files from Sony CyberShot DSC-WX9 not displaying in windows explorer, any way?The MTS files showed up perfectly fine in windows explorer to view last time, but now they're gone and I can't play MTS movie, please help, because this is really getting on my nerves."
Get full version 
Download MTS Video Converter trial versionFirst, Create a new shortcut to Windows Explorer→Properties→The "Target:" field will be something like: "%SystemRoot%explorer.exe"→Simply change that to include the desired directory, like this: "%SystemRoot%explorer.exe folder name". Now that shortcut will open Windows Explorer directly.
Then, I think the easiest way to find MTS files in Windows Explorer is to change "%SystemRoot%explorer.exe"to "%SystemRoot%explorer.exe mtsfolder"→Right click MTS shortcut→choose Explorer→then you can find MTS files in Windows Explorer.
Last, if you want to free play MTS.AVCHD files on Windows 7, you need to install a compatible MTS player.
The VideoLAN VLC Player is the best free player for MTS/M2TS, The following simple steps is tell you how to playback MTS/M2TS video files on Windows, including Windows 7 free with this free VLC Player.
Download VLC Player→Install the downloaded EXE file→Run VideoLAN VLC Media Player →start playing all your MTS/M2TS video files for free.
PS:
VLC Media Player could play back the content (H.264 video and AC3 audio directly without needing DirectShow filters), however, there are also some problems with several MTS/M2TS files.
ALLPlayer, MPlayer, Gom Player, Windows Media Player, Bsplayer and other media players also can play MTS, M2TS, AVCHD files, but some players will need an appropriate codec, component or plug-in installed.
So i think if you want to play MTS freely on your PC, you`d better convert your MTS files to WMV, then you can play, edit and burn your MTS video to home DVD etc easily with best quality and fast speed on Windows 7, vista, xp.
Let's take a look at several common problems about windows explorer:
Where is Windows Explorer?
There are several ways to get it, and all of them are really easy.
1: First, Start menu→All Programs item→Accessories sub-menu→Windows Explorer menu item
Tips: If you have a directory that you like to view often in Windows Explorer, you can Create a shortcut(Windows Explorer menu item→right click→Create a shortcut)
2: If your keyboard has a "Windows Key"→Windows+E brings up Windows Explorer.
3: Right click on My Computer→click on Explore.
4: Click on Start→Run→enter in a folder name(like "C:")→click OK(Windows Explorer will be open up but without the left hand navigation pane).
5: Click on Start→Run→enter in "explorer /e,folder" where "folder" is replaced with the folder you want to view(the left hand navigation pane is visible).
when open video, windows explorer shut download, why?
"Whenever I open a window with video thumbnails in it, I get "windows explorer has encountered a problem and needs to close."
Someone think you can get it to stop crashing as soon as you open the folder by turning off thumbnail cacheing. Others think there may be something from your drive must have got deleted as system restore does not restore the files which were deleted from the drives.
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