How to create custom URI scheme handler?

Question

Uniform Resource Identifier

Good afternoon, there is a task in the internal network and its sites to place links, when clicked on which a certain action took place on the client side

Namely, it turns out to designate your URI Scheme and, based on the context of the link using this scheme, to do this or that action on the user

side At first, I decided to test for the sake of designating the URI, when clicked on, which should open a notebook on the client side, with a parameter in the form of a link to a text document located in a certain network sphere.

To do this, I created the following link on the web page:

<a href="notepad:\\DESKTOP-M48FDKF\\somefolder\somefile.txt">Open txt file by notepad</a>

Then, on the client side, I created a new section in the registry.





And then I decided to check by opening the browser and clicking on this link, warnings pop up from the browser (Microsoft Edge / Chromium) that this link is trying to open notepad, and are you sure about this?
I answer yes and get an error

Не удается найти файл C:\Program Files (x86)\Microsoft\Edge\Application\81.0.416.53\notepad:%5C%5CDESKTOP-M48FDKF%5C%5Csomefolder%5Csomefile.txt.

Вы хотите создать новый файл с таким именем?

And then I understand that most likely the problem is with specifying the path in the link on the web page, but I can’t figure out in what form the link should be given

. It looks like the problem is that the %1 parameter also stores the URI Scheme, i.e. not the value that comes after it, but the full notepad:\\DESKTOP-M48FDKF\\somefolder\somefile.txt
Please tell me

Answer 1

how did you launch arbitrary programs using the link:

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\SOFTWARE\Classes\runapp]
"URL Protocol"=""
@="URL:Universal run app"

[HKEY_CURRENT_USER\SOFTWARE\Classes\runapp\shell]

[HKEY_CURRENT_USER\SOFTWARE\Classes\runapp\shell\open]

[HKEY_CURRENT_USER\SOFTWARE\Classes\runapp\shell\open\command]
@="mshta javascript:new(ActiveXObject)('WScript.Shell').Run(decodeURI('%1'.substr(7))),window.close()"

<a href="runapp:notepad C:\\Users\\User\\Desktop\\test.txt">Открыть test.txt</a>

if desired, you can make it so that only a specific application opens, but this is inconvenient.