File-roller is associated with .ppsx files instead of LibreOffice Impress

Thank you for your bug report

This bug was fixed in the package desktop-file-utils - 0.18-1ubuntu3

---------------
desktop-file-utils (0.18-1ubuntu3) precise; urgency=low

  * debian/defaults.list:
    - set libreoffice as the default handler for slideshow types (lp: #904212)
 -- Sebastien Bacher <email address hidden> Wed, 14 Dec 2011 13:00:53 +0100

Ok, I've fixed the desktop-file-utils association but that's not enough since libreoffice-impress.desktop doesn't claim those mimetypes as supported:

application/vnd.openxmlformats-officedocument.presentationml.slide
application/vnd.openxmlformats-officedocument.presentationml.slideshow

which are the types shared-mime-info use for those formats: sldm, sldx, ppsm, pptx...

so libreoffice needs to be fixed as well

Fix commited upstream for master/3.6:

http://cgit.freedesktop.org/libreoffice/core/commit/?id=b77858bf67f177d6f90969df456a533203996025

http://anonscm.debian.org/gitweb/?p=pkg-openoffice/libreoffice.git;a=commit;h=3b4ccd897a6d1b34266b8cde620d7f6b5e0ac193

Hello YannUbuntu, or anyone else affected,

Accepted libreoffice into precise-proposed. The package will build now and be available in a few hours. Please test and give feedback here. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you in advance!

Fixed!

This bug was fixed in the package libreoffice - 1:3.5.3-0ubuntu1

---------------
libreoffice (1:3.5.3-0ubuntu1) precise-proposed; urgency=low

  * bump version to final, use debian tarballs

libreoffice (1:3.5.3~rc2-0ubuntu1~ppa2) precise; urgency=low

  * reduce l10n set for ppa builds

libreoffice (1:3.5.3~rc2-0ubuntu1~ppa1) precise; urgency=low

  * cherry-pick 496346c9e692b7ba8ec0aa78c78cac7b71d830a5 from
    debian (LP: #986205)
    - guard libdbalo.so mv with feq PACKAGE_BASE=y...
  * upstream bugfix release 3.5.3:
    - fix colorspace conversion for greyscale bitmaps fdo#34324 [Michael Meeks]
    - cache calls to mdds:mixed_type_matrix::size, related fdo#47299 [Markus Mohrhard]
    - clrContourCache for SwAnchoredDrawObjects fdo#45376 [Andreas Schierl]
    - copy column privileges into table privileges fdo#47937 [Lionel Elie Mamane]
    - cppcanvas: processEMFPlus: fix valgrind warning: fdo#42252 [Michael Stahl]
    - disable cairo canvas on Windows fdo#46532, fdo#46901, fdo#45584 [Michael Meeks]
    - do not increase height of checkboxes fdo#47963 [David Tardon]
    - do not play sound in presenter console fdo#33914 [David Tardon]
    - docx, no mso-fit-shape-to-text means the textbox size is fixed bnc#751573 [Cédric Bosdonnat]
    - export all style information to xls/xlsx, fdo#46738 [Markus Mohrhard]
    - fdo43752: PPTX import fix affected odp imports. bnc#719989, bnc#719997 [Muthu Subramanian]
    - find install location during help pack install fdo#48411 [Andras Timar]
    - fix - edge-case trans gradients came out empty fdo#33591 [Thorsten Behrens]
    - fix - use older ODF encryption by default fdo#47484 [Thorsten Behrens]
    - fix RTF import of \page in inner groups fdo#48104 [Miklos Vajna]
    - fix RTF import of all capitals char prop fdo#46955 [Miklos Vajna]
    - fix RTF import of character encoding in footnotes fdo#45182 [Miklos Vajna]
    - fix RTF import of custom fonts in substreams fdo#45394 [Miklos Vajna]
    - fix RTF import of mixed super/nonsuper text fdo#47326 [Miklos Vajna]
    - fix RTF import of multi-paragraph exact height textboxes fdo#47036 [Miklos Vajna]
    - fix RTF import of shapes inside text frames at the start of the doc fdo#47036 [Miklos Vajna]
    - fix RTF import of tables with empty first row fdo#45394 [Miklos Vajna]
    - fix RTL menu rendering on Windows fdo#42537 [Ivan Timofeev]
    - fix border printing: fdo#38635 [Michael Stahl]
    - fix crash on RTF import of shapes inside tables fdo#47802 [Miklos Vajna]
    - fix the fix so it doesn't crash lp#905355, fdo#43895 [Michael Stahl]
    - fix vcl alpha blending bnc#714787 [Thorsten Behrens]
    - fix vertical align when switching mode in multibar fdo#44140 [Noel Power]
    - fixed pdf export (of images). bnc#717947 [Muthu Subramanian]
    - handle various busted rtf docs without hanging fdo#48640 [Caolán McNamara]
    - improved label/BC wizard - set paper size fdo#44516 [Winfried Donkers]
    - increase nCol before next iteratation to prevent loop, fdo#46220 [Markus Mohrhard]
    - macros: Macro to set filter in Calc does not work with .StringValue fdo#46983 [Takeshi Abe]
    - make "Replace All" work with REs fdo#44861 [David Tardon]
    - ...