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"you don't have permission to open this file" when trying to attach in firefox ONLY. Works in other browsers and windows permissions are wide open.

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Only a problem in Firefox. Works in IE and Chrome. I went thru support ideas of checking windows permissions (wide open and the user is the owner), starting firefox in safe mode and uninstalled/reinstalled firefox. Same problem. Any file in My Documents gives the same error, so it is not file related. Any directory under My Documents works the same. I can move files to Desktop and then they attach fine.

Only a problem in Firefox. Works in IE and Chrome. I went thru support ideas of checking windows permissions (wide open and the user is the owner), starting firefox in safe mode and uninstalled/reinstalled firefox. Same problem. Any file in My Documents gives the same error, so it is not file related. Any directory under My Documents works the same. I can move files to Desktop and then they attach fine.

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Did you check the owner of the files and possibly try to make you the owner in case something went wrong?

It is possible that anti-virus software is interfering.
Try to disable the real-time (live) scanning of files in your anti-virus software temporarily to see if that helps.

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As mentioned in the original post, the user IS the owner and the permissions are WIDE open for the user. I have also tried to disable the anti-virus - no luck. The problem is ONLY happening in Firefox. Chrome and IE work perfect. There is also no problem in Windows. The user can add/remove/edit files in the directory. Right now the solution seems to be to use Chrome. I'm not excited about that, but at this point, the only option.