FileZilla is starting Gedit and not Pluma

Filezilla > Edit > Settings > File Editing > Default Editor.. play around with those settings.

Can you set it to Pluma?

Also try opening Nemo, go to the folder of the file you're looking to edit. Right click > open with other application > right click Gedit > forget association

The try in Filezilla again

I don't have Nemo but Caja (using Linux MINT 14 MATE 64 bits, not Cinnamon).
I reported this bug not only to have a solution now but because I would like this bug will not appear in the next version of Linux MINT. Will it be corrected?

In fact, there are a lot of lines to modify (see screenshot).

In my Filezilla, I do not have those lines to modify - there is nothing there.

Try (backing up) and then deleting those lines and have it blank.

Done. It's blank and now, .txt files opens with LibreOffice.

Did you also try changing all the values from 'gedit' to 'Pluma'?

No, I deleted all. How can I use Pluma instead of LibreOffice?

php /usr/bin/pluma
old /usr/bin/pluma
inc /usr/bin/pluma
info /usr/bin/pluma
install /usr/bin/pluma
module /usr/bin/pluma
. /usr/bin/pluma
prev /usr/bin/pluma
tpl /usr/bin/pluma
/ /usr/bin/pluma
css /usr/bin/pluma
cnf /usr/bin/pluma
original /usr/bin/pluma

Thanks. Added these lines but still LibreOffice opening .txt files.

I'm not sure then.

Can you not just open the files from Caja (right click and choose your own application) instead of through Filezilla?

When I clik on a .txt file from Caja, Pluma opens it. When it's from FileZilla, LibreOffice starts it.
Strange. I joined the Filezilla configuration.

Same problem in Linux MINT MATE 16.

Same problem in MINT 17 : now, .txt files are opened with LibreOffice !

You're not alone ... Mint 17 x64, Filezilla starts LibreOffice to view/edit a text file.

I use Caja, and also 'xdg-open filename.txt' from the command line. Both correctly open the text file in Pluma.

I was able to get a usable configuration by adding the following to Edit -> Settings -> File editing -> Filetype associations:
txt "/usr/bin/pluma"

Linux Mint MATE 18 : .txt files are now opened by ... nothing.

Linux Mint MATE 18 : .txt files are still opened by LibreOffice.

Works after adding :

txt /usr/bin/xed