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I'm moving from Win Xp to Win 7.

There are 4500 cookie files in my C:\Documents and settings*UserName*\Cookies directory on XP, dating from 2 days ago back to 2010 (when I last cleaned out older ones).
There is an accompanying index.dat file of 3MB.
I have consistently been using FireFox for the last couple of years, so given the dates I assume they are cookies used by Firefox.

There are a few dozen cookie files in c:\Users*UserName\AppData\Roaming\Microsoft\Windows\Cookies and its subfolder Low on Win 7, all from the last few days.
There are accompanying container.dat files of 0 bytes in both directories.

I use Firefox and did a profile transfer (all settings) with MozBackup. Mozbackup cannot transfer cookies.

I still have access through dual boot to my XP installation. FireFox is set to synchronize, but that does not have a 'cookies' option.

Can I copy the cookie files from the XP dir to the Win7 dir (which of the two?) and will they take effect there?

I may not copy all of them ;-)

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Why not just try it? Or perhaps just try one or two. – Ƭᴇcʜιᴇ007 Feb 19 '14 at 20:25
That folder is not where Firefox cookies are stored. – and31415 Feb 19 '14 at 21:15
@and31415 Interesting - then what are all these recent *.txt files? Investigating... – Jan Doggen Feb 20 '14 at 8:34
@JanDoggen Those cookies were probably created by Internet Explorer or another program which used the related Windows API functions. – and31415 Feb 20 '14 at 11:08
OK, I think I found it: My RSS reader is using the IE engine and I use that practically everyday as well. That's where those .txt cookie files must have come from. – Jan Doggen Feb 21 '14 at 12:23
up vote 2 down vote accepted

I made an incorrect assumption in my question: "given the dates [of the .txt files] I assume they are cookies used by Firefox."

It turns out my RSS reader (RSSOwl) is using the IE rendering engine and in all likelihood it was responsible for those cookies.

As user and31415 pointed out in the comments FireFox cookies are stored in two SQLite databases in the profile.

So copying those cookies is useless for FireFox, but useful for RSSOwl.

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