Version renaming on XP SP3 somehow incompatible

[Robin Bannister]

Following Trevor's hint 
http://lists.gnu.org/archive/html/bug-lilypond/2008-05/msg00137.html 
I have had no problems switching between Lilypond versions by renaming, 
mainly between 2.8.8, 2.10.33 and 2.12.1 (but also 2.13.1).  

Two days ago I also installed 2.13.9. 
It runs OK, but now the older versions crash. 

And now I have also installed 2.12.3. 
Both it and 2.13.9 run OK, but the others crash. 

They all crash in the same way. 

2.13.1's log (for {c'}) says
> # -*-compilation-*-
> Processing `1.ly'
> Parsing...
> Interpreting music... 
> Preprocessing graphical objects...
> Solving 1 page-breaking chunks...

The corresponding XP error report says 
> AppName: lilypond.exe  
> AppVer: 2.13.1.1  
> ModName: libfontconfig-1.dll
> ModVer: 0.0.0.0  
> Offset: 0001360a

Maybe this is just my quirky environment. 
Or maybe I shouldn't expect renaming to work. 

Does anyone else switch like this? 


Cheers,
Robin