Xfce 4.8 + Thunar 1.2.3: opening documents

[hha4491]

Hi,
if I want to open a document calles name.lyx Thunar offers me "open with 
LyX", but it starts lyx-devel.
$>which lyx
/usr/local/bin/lyx
$>which lyx-devel
/usr/local/bin/lyx-devel
Obviously Thunar uses the latter.
Where can I change that, also in the Application-Menu->Office?
-- 
Viele Grüße,
Hartmut

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