That's interesting. Examining the beginning of one of the "big" sheets in
both case, we see that LibreOffice is *very* verbose with what it save. If
I understand it correctly, LO save informations about *every* cells,
including empty ones. Which is very odd, since it does not do it with
*every* sheets.

This does not explain why MSO have to "repair" the files though. Maybe the
devs would be interested in this test case.

-- 
Cley Faye
http://cleyfaye.net

2015-04-23 20:12 GMT+02:00 RamonTavarez <[email protected]>:

> Check the post,  I've uploaded the requested file.
>
> Thanks for your interest.
>
> Regards
>
> *Ramón E. Tavárez B.*
>
> On Thu, Apr 23, 2015 at 1:31 PM, Cley Faye [via Document Foundation Mail
> Archive] <[email protected]> wrote:
>
> > Discussion about open formats aside, I've looked at the file and it looks
> > like when saving as xlsx each sheet grow huge (some goes to ~20MB before
> > compression).
> >
> > Could you also post the xlsx file obtained when saving with MSO, for
> > comparison? My guess is that either LO saves *a lot* of empty/dummy
> cells,
> > or that it saves in an older xlsx format that is less compact.
> >
> > btw this is only a "by curiosity" request, but it could help the dev
> > pinpoint an issue if my first guess is correct.
> >
> > --
> > Cley Faye
> > http://cleyfaye.net
> >
> > 2015-04-23 17:28 GMT+02:00 Tom Davies <[hidden email]
> > <http:///user/SendEmail.jtp?type=node&node=4147063&i=0>>:
> >
> > > Hi :)
> > > Yeh, i don't know a good way around that :(  other than the way you
> > already
> > > use! :))
> > >
> > >
> > > People used to be quite happy with the idea of downloading Adobe
> Acrobat
> > to
> > > read Pdfs with.  It used to be that almost any website that shared any
> > kind
> > > of document tended to only have them as Pdfs and also then 'had to'
> have
> > a
> > > button to help people download and install an Adobe Pdf Reader.  We
> > hardly
> > > see any of that these days but that is quite a recent change.
> > >
> > > There were objections from people working in the council, or other
> > > government offices or in big companies that they couldn't install
> > anything
> > > and thus couldn't use the format that everyone else seemed to be using
> > so
> > > much.  Now they seem to use Pdf more than everyone else, and even
> demand
> > > that other people use it!
> > >
> > > Regards from
> > > Tom :)
> > >
> > >
> > >
> > >
> > >
> > > On 23 April 2015 at 16:08, Ramon Tavarez <[hidden email]
> > <http:///user/SendEmail.jtp?type=node&node=4147063&i=1>> wrote:
> > >
> > > > Hi:
> > > >
> > > > Thanks for your attention.
> > > >
> > > > The fact with this file is that can't be supported by .XLS format,
> and
> > my
> > > > coworkers doesn't work with LibO, and that is the only way I can use
> > to
> > > > "keep in touch" with them and their jobs. It may be a pain .. ... ...
> > ,
> > > > but while it work I'll keep using this method to share my jobs with
> > them!
> > > >
> > > > In  use LibO for every document  I  create, even I update every
> > version
> > > of
> > > > LibO  as the module for my Linux distro: Porteus.
> > > >
> > > > On the other hand,I can understand the situation with MSOffice and
> how
> > > > they refuse the OpenDocument formats, but I still worry about   the
> > big
> > > >  file size for those files not supported by the "classical" file
> type.
> > > >
> > > > This can lead erroneously, as you said,  to people to believe that
> > > > everyone else made bad spreadsheet programs and everyone should stick
> > > with
> > > > MS.
> > > >
> > > > Thanks.
> > > >
> > > > *Ramón E. Tavárez B.*
> > > >
> > > > On Thu, Apr 23, 2015 at 10:47 AM, Tom Davies <[hidden email]
> > <http:///user/SendEmail.jtp?type=node&node=4147063&i=2>> wrote:
> > > >
> > > >> Hi :)
> > > >> The XlsX, and other OOXML formats are notoriously unreliable.  Each
> > > >> different version of MS Office uses slightly different versions.
> > There
> > > are
> > > >> at least 3 different "transitional" versions of the format and they
> > are
> > > not
> > > >> always compatible with each other.
> > > >>
> > > >> If you take the XlsX that was saved by MS Office 2013 and try
> opening
> > it
> > > >> in another version of MS Office, say 2010 or 2007, or even 365 then
> > you
> > > may
> > > >> well find it's been opened in "Compatibility Mode" or even that it
> > > doesn't
> > > >> work at all in extreme cases.  Chances are that some things will
> have
> > > moved
> > > >> around or vanished, especially if you have anything in a frame (such
> > as
> > > >> images).
> > > >>
> > > >> It makes a bit of sense that a file created with newer software
> might
> > > not
> > > >> fare too well on older versions of the same program but with XlsX
> and
> > > the
> > > >> other OOXML formats it even seems to happen the other way around.
> > Save
> > > a
> > > >> file in MS Office 2007 and you get the same problems trying to open
> > that
> > > >> file in more recent versions of MS Office.
> > > >>
> > > >>
> > > >> MS keep the specs for their formats secret.  There is an ISO
> > definition
> > > >> of OOXML but that doesn't seem to work in any version of MS Office.
> > MSO
> > > >> 2013 was the first that allowed people to save in "strict" but the
> > > >> resultant files don't seem to be able to be opened in any version of
> > MS
> > > >> Office.
> > > >>
> > > >> So pretty much all programs struggle with trying to read or write
> > XlsX
> > > or
> > > >> other OOXML files in any reliable way.  Which version of MS Office
> > > should
> > > >> they aim for?
> > > >>
> > > >> Actually we had a few times where the LibreOffice user in an office
> > has
> > > >> been the only person able to open files from colleagues using
> > different
> > > >> versions of MS Office and has then become a kinda stepping stone for
> > > >> sharing files between those colleagues.  Similarly with OpenOffice.
> > > >>
> > > >>
> > > >> Best advice seems to be to use either;
> > > >> 1.  the older MS Office format, Xls (without the X on the end), for
> > MS
> > > >> Office Xp/2000 and prior or
> > > >> 2.  stick with Ods.
> > > >>
> > > >> Microsoft, in their 2010 version, refused to use the ODF 1.2 format
> > that
> > > >> everyone else was using at the time and stuck with a mangled version
> > of
> > > the
> > > >> older 1.0 (even ignoring the 1.1) and somehow that led to Ods
> > appearing
> > > to
> > > >> open just fine but all the formulas got replaced by fixed values.
> > Their
> > > >> apparent failure somehow led to people saying that everyone else
> made
> > > bad
> > > >> spreadsheet programs and everyone should stick with MS.
> > > >>
> > > >>
> > > >> So it is well worth avoiding XlsX and it is probably best to use
> > their
> > > >> older Xls format instead - at least if you want to open the
> > spreadsheet
> > > on
> > > >> any machine other than the one with MS Office 2013 on.
> > > >>
> > > >> Regards from
> > > >> Tom :)
> > > >>
> > > >>
> > > >>
> > > >>
> > > >> On 23 April 2015 at 15:03, RamonTavarez <[hidden email]
> > <http:///user/SendEmail.jtp?type=node&node=4147063&i=3>> wrote:
> > > >>
> > > >>> Hi:
> > > >>>
> > > >>> I've experienced the following issue:
> > > >>>
> > > >>> The file attached is an .ODS file (1,976 KB).  When seved as  .XLSX
> > > file
> > > >>> it
> > > >>> expands to more than 15 MB.
> > > >>>
> > > >>> If the new .XLSX files is oppened with MSOffice 2013 it will ask
> for
> > > >>> recovery of information within the file,  after that if we save the
> > > >>> recovered file to the same file type (.XLSX) the file shrinks to
> > > 2,393KB.
> > > >>>
> > > >>> Why?
> > > >>>
> > > >>>
> > > >>>
> > >
> >
> OBRA_CIVIL_TERMINACION_ESTACION_Y_MODULO_ENTRADA_EST_21_LINEA_2B_abril_2015.ods
> >
> > > >>> <
> > > >>>
> > >
> >
> http://nabble.documentfoundation.org/file/n4147038/OBRA_CIVIL_TERMINACION_ESTACION_Y_MODULO_ENTRADA_EST_21_LINEA_2B_abril_2015.ods
> > > >>> >
> > > >>>
> > > >>>
> > > >>>
> > > >>> --
> > > >>> View this message in context:
> > > >>>
> > >
> >
> http://nabble.documentfoundation.org/Calc-LibO-4-4-Bug-on-ODS-to-XLSX-file-conversion-tp4147038.html
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> > > >>>
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