I want to execute a windows program with parameters like
D:\SYNCHRONISIEREN\FileSync.exe -sd {leftpath} -td {rightpath},
but the path from left lister and right lister does not work.
It always open the program FileSync without parameters.
But which paths do you have in the left and right sides?
Have you tried running the same thing (with two folder paths as needed, in quotes if they contain spares) from a command prompt? If that doesn't work either then you've got the program's command line arguments wrong.