[x_Master_x]

Dall'immagine non si capisce se stai cliccando su un file conosciuto oppure no
E' un problema del tuo registro perché dovrebbe apparire. Vai alla chiave:

HKEY_CLASSES_ROOT\*

Fai una copia di backup della chiave ed eliminala. Aggiungi questa chiave al registro, è presa da una VM pulita

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\*]
"ContentViewModeLayoutPatternForBrowse"="delta"
"ContentViewModeForBrowse"="prop:~System.ItemNameDisplay;System.ItemTypeText;~System.LayoutPattern.PlaceHolder;~System.LayoutPattern.PlaceHolder;System.DateModified;System.Size"
"ContentViewModeLayoutPatternForSearch"="delta"
"ContentViewModeForSearch"="prop:~System.ItemNameDisplay;~System.ItemFolderPathDisplay;~System.LayoutPattern.PlaceHolder;System.ItemTypeText;System.DateModified;System.Size"
"AlwaysShowExt"=""
"PreviewDetails"="prop:System.DateModified;System.Size;System.DateCreated;*System.OfflineAvailability;*System.OfflineStatus;*System.SharedWith"
"PreviewTitle"="prop:System.ItemNameDisplay;System.ItemTypeText"
"FullDetails"="prop:System.PropGroup.FileSystem;System.ItemNameDisplay;System.ItemTypeText;System.ItemFolderPathDisplay;System.Size;System.DateCreated;System.DateModified;System.FileAttributes;*System.OfflineAvailability;*System.OfflineStatus;*System.SharedWith;*System.FileOwner;*System.ComputerName"
"TileInfo"="prop:System.ItemTypeText;System.Size;System.DateModified"
"ExtendedTileInfo"="prop:System.ItemTypeText;System.Size;System.DateModified;System.OfflineAvailability"
"InfoTip"="prop:System.ItemTypeText;System.Size;System.DateModified"
"QuickTip"="prop:System.ItemTypeText;System.Size;System.DateModified"
"ConflictPrompt"="prop:System.ItemTypeText;System.Size;System.DateModified;System.DateCreated"
"SetDefaultsFor"="prop:System.Author;System.Document.DateCreated"
"NoStaticDefaultVerb"=""
"NoRecentDocs"=""

[HKEY_CLASSES_ROOT\*\OpenWithList]

[HKEY_CLASSES_ROOT\*\OpenWithList\Excel.exe]

[HKEY_CLASSES_ROOT\*\OpenWithList\IExplore.exe]

[HKEY_CLASSES_ROOT\*\OpenWithList\MSPaint.exe]
@=""

[HKEY_CLASSES_ROOT\*\OpenWithList\notepad.exe]
@=""

[HKEY_CLASSES_ROOT\*\OpenWithList\Winword.exe]

[HKEY_CLASSES_ROOT\*\OpenWithList\WordPad.exe]
@=""

[HKEY_CLASSES_ROOT\*\shell]

[HKEY_CLASSES_ROOT\*\shell\removeproperties]
"ProgrammaticAccessOnly"="Apartment"

[HKEY_CLASSES_ROOT\*\shell\removeproperties\DropTarget]
"CLSID"="{09a28848-0e97-4cef-b950-cea037161155}"

[HKEY_CLASSES_ROOT\*\shellex]

[HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers]

[HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers\BriefcaseMenu]
@="{85BBD920-42A0-1069-A2E4-08002B30309D}"

[HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers\Open With]
@="{09799AFB-AD67-11d1-ABCD-00C04FC30936}"

[HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers\Open With EncryptionMenu]
@="{A470F8CF-A1E8-4f65-8335-227475AA5C46}"

[HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers\Sharing]
@="{f81e9010-6ea4-11ce-a7ff-00aa003ca9f6}"

[HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers\{90AA3A4E-1CBA-4233-B8BB-535773D48449}]
@="Taskband Pin"

[HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers\{a2a9545d-a0c2-42b4-9708-a0b2badd77c8}]
@="Start Menu Pin"

[HKEY_CLASSES_ROOT\*\shellex\PropertySheetHandlers]

[HKEY_CLASSES_ROOT\*\shellex\PropertySheetHandlers\BriefcasePage]
@="{85BBD920-42A0-1069-A2E4-08002B30309D}"

[HKEY_CLASSES_ROOT\*\shellex\PropertySheetHandlers\CryptoSignMenu]
@="{7444C719-39BF-11D1-8CD9-00C04FC29D45}"

[HKEY_CLASSES_ROOT\*\shellex\PropertySheetHandlers\{1f2e5c40-9550-11ce-99d2-00aa006e086c}]

[HKEY_CLASSES_ROOT\*\shellex\PropertySheetHandlers\{3EA48300-8CF6-101B-84FB-666CCB9BCD32}]
@="OLE DocFile Property Page"

[HKEY_CLASSES_ROOT\*\shellex\PropertySheetHandlers\{883373C3-BF89-11D1-BE35-080036B11A03}]
@="Summary Properties Page"

A questo punto "Apri con" per le estensioni conosciute dovrebbe ritornare, disconnetti-riavvia il PC.