To day I had one of those events where the PTB takes alsmost for ever to start and fills the ram with ????.
I was not using any external apps for attachments etc.
I had custom setting in the attachment handling for jpg, doc, and pdf , all pointing to portable software on the same stick.
Incidently, I had just also the folder on the windows explorer where the PTB is located open. I could from here see that the mimetypes was just incrementing in size, starting from its few kb to over 500mb. During that time nothing happend otherwise, the PC was quite 'frozen'.
Have managed to open the taksmanager of windows and observed that the process thunderbird.exe was running, but the steady rise of memeory use was caused by the thuderbirdportable.exe.
Managed to stop all that and deleted the mimetypes file , restarted the TB and all was OK. However I had to set the custom mimetypes again, obviously the setting was now set back to default.
Are there any ideas waht is causing this 'reunaway' of the mimitypes ?
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This is a problem that persisted for a while.
See the tread at https://portableapps.com/node/16341
especially the 3rd last post in that thread.
On my machine, specifying any file location for any file extension causes TB to corrupt the mimeTypes.rdf as shown in the thread.
The only way to fix this is specifying default windows file extension handling or waiting for TB developers to repair the mimeTypes.rdf corruption.
and I thought first that adding portable apps (on the same drive) as handles for the attachments will avoid the problem, but it looks really as you says that this is even more causing the problem to occur. In fact I had this problem never before, but after reading some threads abt it, I decided to point to some portable apps. And surprise, after a day or so successful use, suddenly the TB started go crazy, the file mimetypes being filled with some garbage almost infinitely, I think it goes on as long as it is able to create in ram and swapfile or what.
OK, pointing set to some of the portable handlers seems finally anyway questionable, since it stores the path to the app in absolute value, which will then change when the stick is in other computer.
Otto Sykora
Basel, Switzerland
In my experience, you can change mimTypes.rdf by adding absolute addresses, while TBP is running and works fine. The corruption occurs while TBP saves files during TBP shutting down. This is then noticed when launching next time.