File sort order

This is an issue that is not unique to elemfm2. It also afflicts gnome-commander and I'd guess some other apps. It does not affect ls.
I'm running Ubuntu Lucid 10.04.1 (Gnome). I have a directory with a number of files. Here are a few of the names: 

jnrv_07312010.pdf
jnrv101004.tex
jnrv20100811.ps
jnrv2010a.tex

But the sorted pane for this directory (and in Gnome-Commander) is

jnrv2010a.tex
jnrv101004.tex
jnrv20100811.ps
jnrv_07312010.pdf
Does anyone know of documentation of this? I suspect some strange collating sequence rules that have been embedded somewhere that will be awkward to find. In this case, there is really no problem, but I came across this in a directory with several hundred files and couldn't find one I'd just moved into the directory, at least not for a while. 

For completeness, mc gets the ordering

jnrv101004.tex
jnrv20100811.ps
jnrv2010a.tex
jnrv_07312010.pdf

which increases my suspicions about collate sequence etc.


JN


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