How to get an form with language selection and Shellexe with special number

Hello,

How to get an form with language selection and Shellexe with special number of the right langauge.

Example:
The user get a form and select a language.
English
Deutsch
Spain
... about 8 or so.

ExecWait '"$INSTDIR\MyFile.exe" 1' > for English
ExecWait '"$INSTDIR\MyFile.exe" 2' > for Deutsch
...
Here I need a variable to can execute this when install.

Use ${If} or ${Switch} on $LANGUAGE and ${LANG_ENGLISH}, ${LANG_DUTCH} etc

Stu