![]() Introduced in Windows 8. Ensures that the verbs for the file type are invoked with a URL instead of a downloaded version of the file. Use this flag only if you’ve registered the file type’s verb to support DirectInvoke through the SupportedProtocols or UseUrl registration. The FTA_AlwaysUseDirectInvoke bit can be set in the type’s EditFlagsregistry value. Now, for certain types, the server doesn’t even need to ask for DirectInvoke behavior via the X-MS-InvokeApp header. Reg query "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths" /f "UseUrl" /s \SupportedProtocolsĪpps registered to handle URLs via the old UseUrls mechanism can be easily enumerated from the command line: Windows Media Player’s verbs registration looks like this: HKCR\Applications\\SupportedProtocols or HKCR\CLSID\\SupportedProtocols can be populated using values that identify the Uniform Resource Identifier (URI) protocol schemes that the application supports or * to indicate all protocols. Application Opt-inĪpps can register to handle URLs via the SupportedProtocols declaration for their verbs. As of September 2021, “HP’s Wolf Security” software (version 4.) exhibits such a bug. Note: This execution will fail if security software on the system breaks ShellExecuteEx‘s support for SEE_MASK_CLASSKEY. The browser launches the handler by calling ShellExecuteEx, passing in the SEE_MASK_CLASSKEY flag, with the hke圜lass set to the registry handle retrieved from IQueryAssociations::GetKey when passed ASSOCKEY_SHELLEXECCLASS for the DirectInvoke’d resource’s MIME type. If the user accepts the prompt, the handler application is launched, passing the URL to the web content. ![]() When a client application registers itself indicating that it supports receiving URLs rather than local filenames, and when the server indicates that it would like to DirectInvoke the application using the X-MS-InvokeAppresponse header: While a poorly-documented precursor technology existed as early as the late 1990s, Windows 8 reintroduced this feature as DirectInvoke. To address these shortcomings, we need a way to instruct the browser: “ Download this file, unless the client’s handler application would prefer to just get its URL.” Internet Explorer and Microsoft Edge support such a technology. That brokenness will occur even if they happen to have another client (e.g. However, the AppProtocol approach has a shortcoming– if the user doesn’t happen to have Microsoft Word installed, the protocol handler will fail to launch and either nothing will happen or the user may get a potentially confusing error message. …which directs Microsoft Word to download the document from. For instance, the Microsoft Office clients might support a syntax like: ms-word:ofe|u| Rather than sending a file download, a solution developer might instead just invoke a target application using an App Protocol. Performance – “ If the user already had a copy of this 60mb slide deck, maybe skip downloading it again over our expensive trans-Pacific link?“.Functionality – “ If the user makes a change to this file, to where should I save changes back?“, and.Security – “ Do I trust the source of this file?“.However, there’s a downside to traditional downloads - unless the file itself contains the URL from which the download originated, the client application will not typically know where the file originated, which can be a problem for: These approaches are well-supported across browsers (via headers for decades, via the download attribute anywhere but IE since 2016). Setting a download attribute on the hyperlink pointing to the file.Sending a Content-Disposition: attachment filename=whatever.ext response header.Specifying a non– webby type in the Content-Type response header.Your server indicates that a file should be treated as a download in one of a few simple ways: Typically, if you want your website to send a document to a client application, you simply send the file as a download. Note: This post is part of a series about Web-to-App Communication techniques.
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