If-Structure
 

Is there a possibility to use || in a if-structure? e.g.

${If} ${IsWinXP ||IsWinVista}

Otherwise my .nsi will be not very clearly arranged

code:
${If} ${IsWinXP}

${OrIf} ${IsWinVista}

Or in this case...

code:
${If} ${AtLeastWinXP}

Special Thanks!!!