![]() Again, the default value is not required, it simply aids in the debugging process. This list is used as an optimization by the system to enumerate all registered preview handlers for display purposes. Step 3:įinally, the preview handler must be added to the list of all preview handlers. The entries under the InprocServer32 subkey include a reference back to the file name extension's ProgID subkey as well as an entry for a VersionIndependentProgID. The xyzfile ProgID subkey is stored with the other ProgIDs as shown here: HKEY_CLASSES_ROOTĮach preview handler ProgID subkey contains a subkey named shellex that contains a subkey always named when installed on 64-bit operating systems. I checked it and the Markdown previewer works now. The following entry associates the xyzfile ProgID subkey with the. I opened up File Explorer Options, and for some reason, the setting ticked 'Show preview handlers in preview pane' was unchecked. Instructions Step 1:įirst, a file name extension is associated with a ProgID. Registration of a preview handler is a standard file association-based registration. For the purposes of illustration, examples in this topic use a. This topic explains how to register a preview handler associated with a given data type.
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