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Possible to pass application arguments in handlers.json?

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Following the deprecation of the FTP protocol in Firefox I have, as a workaround, set Excel to open all ftp links in Firefox for me. However, ideally, I would like a custom PowerShell script to handle all ftp links for me in Firefox. But to do so you would have to pass arguments to an application (in this case PowerShell) in handlers.json file. I guess that is not possible, or am I wrong here?

Following the deprecation of the FTP protocol in Firefox I have, as a workaround, set Excel to open all ftp links in Firefox for me. However, ideally, I would like a custom PowerShell script to handle all ftp links for me in Firefox. But to do so you would have to pass arguments to an application (in this case PowerShell) in handlers.json file. I guess that is not possible, or am I wrong here?

Chosen solution

Solved it by converting my PowerShell script to an exe program with PS2EXE.

Now it can handle all ftp url:s in Firefox.

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Chosen Solution

Solved it by converting my PowerShell script to an exe program with PS2EXE.

Now it can handle all ftp url:s in Firefox.

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That sounds easiest and also allows control of the icon.

What I have done with VBScript files is added a command line to the Registry along the lines of the following (for a custom protocol):

wscript.exe "C:\myscript.vbs" "%1"

I assume PowerShell has a similar command line.