Questions about FileMeta #113

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1. Dijji commented on Mar 3, 2021

   

   Dijji

   on Mar 3, 2021

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   As far as I know, Issues are the recommended way to ask questions in a GitHub project, so you are fine. To get onto the answers:

   1. The Association Manager does indeed set up FullDetails, PreviewDetails and InfoTip registry keys, but it does so only for files, and not for folders and drives. The primary key is file extension, and the edited values are stored under HKCR\SystemFileAssociations under the extension name. The Association Manager will also manage what property handler is set up for a given extension. A File Meta provided property handler stores properties in a file's alternate stream, which is what enables File Meta to set up meta data storage for a text file.
   2. Correct
   3. My perception of what is most commonly used. InfoTip was only added relatively recently.
   4. See https://docs.microsoft.com/en-us/windows/win32/properties/building-property-handlers-property-lists for a list of the extension registry values and their visual effects.
2. Bamajon1974 commented on Mar 4, 2021

   

   Bamajon1974

   on Mar 4, 2021

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   Thank you for the reply. I have a few follow up questions....

   1. I have noticed that file extensions have FullDetails, InfoTip, PreviewDetails, TileInfo, etc. registry keys that are editable in both HKCR and many are duplicated in HKCR\SystemFileAssociations. Should file metadata be edited in the SystemFileAssociations key rather than the root keys? Or does it matter?

   2. In parallel to the Association Manger assigning the relevant properties for files, is there a better place other than microsoft you recommend that would have a great explanation what properties should be assigned to drives, folders and libraries?

   3. FYI, i discovered you can add a details tab to foldes, drives and libraries by adding the following registry modification:
      HKCR\Directory (or Drive or LibraryBackground) \shellex\PropertySheetHandlers{883373C3-BF89-11D1-BE35-080036B11A03}]
      @="Summary Properties Page"

   4. These two property handlers for folders.....System.FileCount and System.TotalFileSize; they don't show up for folders in details or preview window. How do you get them to display?

   Thanks!
3. Dijji commented on Mar 4, 2021

   

   Dijji

   on Mar 4, 2021

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   1. The HKCR.ext entries are the older form, and in fact take precedence if both exist. File Meta used to use them for this reason. But there is a drawback. If you look at the entry for .txt, it delegates, through its default value, to txtfile, where the Shell key is held (in this case, a Shell key on .txt would be ignored). So File Meta used to follow the chain, and set the properties on the lowest delegate. However, the delegates are shared. The .log extension entry also points to txtfile. I didn't want to set the properties for both of them, or make it impossible for them to have different properties. So I shifted to the strictly per extension SystemFileAssociations, which Microsoft were already migrating to over time.
   2. I need to correct your terminology here, in case it is misleading your thinking. Properties are not assigned to drives; drives have properties, which are intrinsic and not as far as I know, extensible. Folders and files also have intrinsic properties, such as size and date modified. Particular file types may also have property values saved in their specific format, such as comments in a Word document. Windows uses property handlers to retrieve such properties, provides many such handlers of its own, and allows the definition of additional ones for formats it does not understand. File Meta extends this support still further to allow the storage of property values in alternate streams associated with a file. All properties are pre-defined by Windows (though again, the set is extensible). So you can't assign a property to a drive, for example. What you can do is ask Windows for a property store linked to a drive, and then try and retrieve named property values from it, the vast majority of which will not have a value. So things like FullDetails simply list the property names that Explorer will try to retrieve to populate a particular part of its UI. For a subset of properties, there are also APIs that retrieve their values directly, such as for file size. To get back to your question, there are many third party programs that read these properties and use these APIs. But none that I know of is as general and configurable as Explorer.
   3. Very interesting, I didn't know about this, but will explore it.
   4. You would need to find a registry key that configures Explorer and tells it what properties to read for these display areas, but I do not know of one, and it may not exist.
4. Dijji commented on Mar 15, 2021

   

   Dijji

   on Mar 15, 2021

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   I have just discovered and enabled the relatively recent Discussions feature, which is what this issue should always have been. I'm going to transfer it to Discussions, under Q & A.
5. Dijji

   closed this as completedon Mar 15, 2021
6. Repository owner locked and limited conversation to collaborators on Mar 15, 2021