Application Handlers
Hi All, I have been on the struggle bus lately trying to get the application handlers set properly in our GPO. I am trying to get PDF, webp, avif to open in browser, and jnlp to auto launch Java. Any help will be greatly appreciated!
{"application/pdf":{"action":3,"extensions":["pdf"]},"image/webp":{"action":3,"extensions":["webp"]},"image/avif":{"action":3,"extensions":["avif"]},"application/x-java-jnlp-file":{"action":4,"handlers":[{"name":"javaws.exe","path":"C:\\Program Files (x86)\\Java\\jre-1.8\\bin\\javaws.exe"}],"extensions":["jnlp"]}}
Chosen solution
Yeah, you shouldn't need to modify anything for the other stuff.
And yeah, those should definitely work for jnlp.,
Read this answer in context 👍 1All Replies (6)
The actions need to be actual names not numbers.
Have you taken a look at Handlers here?
https://mozilla.github.io/policy-templates/#handlers
Also, JNLP only works on the ESR (long story)
Thank you for that information! So the handler action can be a number in the local Handlers.json in the local profile, but not in the GPO, got it. I guess there is simply not an action for "open in browser" or "handle internally"..?
> I guess there is simply not an action for "open in browser" or "handle internally"..?
Yeah, I figured most of those would just happen by default. Have you found a case where I need to add it?
I'm guessing webp, avif, and PDF are, by default, set to open in browser and my broken policies are changing them to save to file? So I just need to set a GPO handler for JNLP only, I think (I am on ESR102.7) This should work for the JNLP handler GPO, right? Thanks again for your time and support!!!
{
"mimeTypes": {
"application/x-java-jnlp-file": {
"action": "useHelperApp",
"ask": false,
"handlers": [{
"name": "Java(TM) Web Start",
"path": "C:\\Program Files (x86)\\Java\\jre-1.8\\bin\\javaws.exe"
}]
}
},
"extensions": {
"jnlp": {
"action": "useHelperApp",
"ask": false,
"handlers": [{
"name": "Java(TM) Web Start",
"path": "C:\\Program Files (x86)\\Java\\jre-1.8\\bin\\javaws.exe"
}]
}
}
}
Modified by Chris Wilkerson
Chosen Solution
Yeah, you shouldn't need to modify anything for the other stuff.
And yeah, those should definitely work for jnlp.,
Thank you so much, Mike!