call to external application fails with R2006a

Hi!

Im using R2006a, and would like to call a C++-Application
(MLCPMain.exe).
While using a Matlab Version prior to R2006a i had no problems with
the following statement:
Result = dos('MLCPMain.exe session.xml');
when i execute the command via start->run (pasted output from
matlab) it works perfect, the call dos(...); returns value 128 since
ive installed R2006a. It complains that there´s no process to wait
for - because it didnt even start the process (so it seems).
Are there any changes in the "dos" function in R2006a?
Or has anyone similar problems?
I cant really figure out whats wrong.

thanks for help
clemens
.

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