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Hello,
since I've upgraded to 1.5.0.2 yesterday, I have one problem:
Starting PortableThunderbird.exe I've got a warning message:
.... Path ..... Coudnot write to registry cause something is in use
there's a similar message if I close the program
All other thinks work fine.
Interesting is, in the path there is infront of the filename a doble backslash.
???
Greetings
I got this same message today too! 
Then I thought well I'll log in as an administrator and let whatever registry setting that's trying to post, post and everything will be kosher when I log back in as a 'PowerUser' (don't really know what I am considered because I log into a Domain). 
But then I got the following messages on Open and Close:
"Cannot import G:\PortableThunderbird\Data\registry\"
:This part varies depending on action in progress:
OnOpen = {thunderbird_portable.reg} and
OnClose = {thunderbird_localbackup.reg}
": Not all data was successfully written to the registry. Some keys are open by the system or other processes."
But other than that, PTB seems to function as usual. 
/s/ When life turns your dreams to dust, vacuum 
Do you have some kind of monitor running? On a guest or limited acct, the registry changes should just fail and the launcher keeps on working. Are these Windows messages popping up?
Hi John,
no monitor is running.
I'm logged in as a domainuser with no adminrights (W2K)
Claus D.
from Hamburg/Germany
Yes these are windows generated errors. I can post or send if you want.
No monitor that I know of. W2K SP4 as domain user with no install rights.
/s/ When life turns your dreams to dust, vacuum
Fixed that problem.
Renamed teh folder data\registry to data\registry.bak
No more popups
Claus D.
from Hamburg/Germany
Works great now!
/s/ When life turns your dreams to dust, vacuum
I got the same error too. I'm using Portable Thunderbird on a library PC...
Renamed teh folder data\registry to data\registry.bak
No more popups
you can rename it to whatever you want or delete it altogether, and the error/popups will go away. so we didn't really fix the problem yet.
These two files in the folder data\registry are being executed whenever Portable Thunderbird starts or quits. When they're executed (opened) they try to add some data to the Windows Registry. Probably to enable some funcionality to certain Thunderbird Extensions that make use of the Registry. If you don't have access to the registry (or something alike) you get that error.
So, if you don't need to use any extensions that use the registry just delete that folder in portable thunderbird (or rename it so the program can't find it). But it would be nice if someone would build a fix for that bug. Thx!
Actually, you can safely ignore the message or rename the folder if needed. The files are only used to prevent Thunderbird from registering itself as the default mail client (which it wants to do by default on every machine you run it on). If you have no rights to the registry, it's supposed to just fail and not cause a popup, which it doesn't appear to be doing. I'll check it out and release a patch to address this.
I've noticed that when I run PTB at home on my latop, it wants to set the default email. I guess in Win2K renaming the folder disables the set default email bit, and in WinXP Pro SP2 renaming the folder keeps it from doing not trying to set it as the default app.
/s/ When life turns your dreams to dust, vacuum
Escape characters are characters that would normally be interpreted as functions(e.g. in Java, \t sets an indent, so if you wanted to literally print "\t" you would type \\t).
Slashes are used to initiate escape characters in strings. These characters vary by language, but a double slash is needed so that it doesn't use the one slash to initiate an escape character.
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