I recently received the error message "The associated helper application does not exist" whenever I tried to download - and run - a torrent file from within Firefox. The associated helper application is a third party application that is either added to the download actions list be default or when a user is selecting to always open a file type with an application.
There is however no way to add default applications on your own which makes it difficulty if one receives this error message. I first took a look at the Download Actions list only to find out that no torrent entry was in that list. You can take a look at all Download Actions in Firefox by clicking on Tools > Options, then the Content Tab and in there on the Manage button next to File Types.
If you see the file extension in the list you could simply click on change action to change the application that opens it by default. This can be necessary for instance if you switch from one application to another.
My case was a little bit different. Since there was no torrent file type in that list I had to reset the Download Actions to see the window again that asks me what to do with torrent files.
The file mimetypes.rdf handles that. If you delete that file after closing Firefox it will have the result that everything will be reset and the file will be generated again after restarting Firefox.
Firefox will ask you then what it should do with unknown files types. I was able to assign the torrent files again to my torrent client and everything worked fine from then on again.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.