Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Natao arisiva ity resaka mitohy ity. Mametraha fanontaniana azafady raha mila fanampiana.

Cannot reset application used to open certain file types

  • 2 valiny
  • 3 manana an'ity olana ity
  • 6 views
  • Valiny farany nomen'i rstein02

rstein02
rstein02
more options

I am unable to reset Firefox to use my current version of Quickbooks to open .QBO files. It keeps giving me an error message:

"C:\Users\Randy\AppData\Local\Temp\EXPORT.QBO could not be opened, because the associated helper application does not exist. Change the association in your preferences."

I have set it to use the default Quickbooks application. in Tools, Options, Applications.

I previously had two versions of Quickbooks installed while I was beta testing one and set it to open the non-beta version.

It worked normally then.

I think it is still trying to open a Quickbooks version that does not exist anymore.

I am unable to reset Firefox to use my current version of Quickbooks to open .QBO files. It keeps giving me an error message: "C:\Users\Randy\AppData\Local\Temp\EXPORT.QBO could not be opened, because the associated helper application does not exist. Change the association in your preferences." I have set it to use the default Quickbooks application. in Tools, Options, Applications. I previously had two versions of Quickbooks installed while I was beta testing one and set it to open the non-beta version. It worked normally then. I think it is still trying to open a Quickbooks version that does not exist anymore.

All Replies (2)

jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 25 Contributor
more options

Have you tried setting it to "Always Ask" to see whether it lets you store a new setting?

If necessary, you can clear all the Application preferences by renaming a file.

(1) Open your personal settings (AKA Firefox profile) folder

Help > Troubleshooting Information > "Show Folder" button

(2) Switch back to Firefox and exit the program (e.g., Firefox > Exit or File > Exit)

(3) Wait a few moments for Firefox to finish updating files in your settings folder, then rename mimeTypes.rdf to something else, like mimeTypes-bad.rdf or mimeTypes.old. Alternately, you can delete the file.

(4) You're done with your profile folder and you can restart Firefox now.

rstein02
rstein02 Tompon'ny fanontaniana
more options

I had already tried the "Always Ask" option with no success.

The rename mimeTypes.rdf file worked.

Thanks.