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FAQs & Knowledge Base

Welcome to our Knowledge Base. Search or browse through the topics below to find answers to your questions.

Categories: ShellBrowser Delphi Components | Show all categories

ShellBrowser uses registered preview handler shell extensions for the FilePreview component. Some of these extensions belong to Windows, others are installed with third party applications.

If the FilePreview is not working, please check the following list:

  • Does Windows Explorer preview the files correctly? If no, there is either no preview handler installed, or it is not working correctly. Try updating the respective program. 
  • If the problem occurs in a x86 application, please try compiling a 64-bit version.  
  • The FilePreview component works asynchronously. Depending on the context (versions of Windows, Rad Studio and the PreviewHandler, but also the layout of the form containing the Preview) some Preview Handler may not work or show visual glitches.
     
    Try forcing the loading of the preview into the main thread, by implementing the OnLoadPreview event of the Preview. 
  • If all of this fails, don't hesitate to contact the support. In this case, please provide details on the error: versions of Windows, the IDE and the program that provides the PreviewHandler.

All of our products are being developed in Delphi or C#. Although we use Log4Net with some of the components, they are safe to use, because the reported vulnerability applies to Log4J only.

None of our applications depend on Log4J or any other Java library and are thus not affected by this vulnerability.

This applies to all versions and editions of our applications (TreeSize, SpaceObServer, SpaceObServer WebAccess, HeavyLoad, SmartPOP2Exchange, Exchange Server Toolbox, SpamAssassin in a Box, SpamAssassin for Windows, SmartCallMonitor, SEPA-Transfer, ServerSentinel, and ShellBrowser). It is recommended to always use the latest available versions though to benefit from the latest patches, improvements, and features.

Unfortunately this is beyond the scope of ShellBrowser components. You have to write a "shortcut menu handler" or other type of shell extension to do so.

See the Microsoft documentation for an overview.

As ShellBrowser makes use of the preview handlers in the system via a  limited official interface, the previews are unfortunately "as is".

If you are requesting additional features, you mostly have to find a different preview. Especially for pdf several programs providing preview handlers are available.

It seems, that depending on the Windows version, the system's preview handler is not automatically registered.

You can do so manually in the registry, or implement the "OnLoadPreview" event to assign the Preview Handler GUID, e.g. :

if (UpperCase(ExtractFileExt(eventArgs.Path)) = '.EML') then begin
  
eventArgs.PreviewHandlerGuid := TShellPreviewHandlerGuids.Mime;