Can not run EXE on MS XP, PHP 4.2.3 as an module

Hallo! I have PHP 4.2.3 as an module (php4isapi.dll), MS Windows XP Professional (NT 5.1) EN, MS IIS 5.1, both SP 1. I have program "tile.exe" in web doc root. I have tried to execute it in any way this program using <?php $command = [FullPathToExecutable];//both single and double backslashed exec($command); shell_exec($command); passthru($command); shell($command); ?> No success (Unable to execute or Unable to fork). In php.ini I do not use safemode, temporary I have enabled above system functions. Other PHP scripts runs OK. I have read many comments from users on on-line documentation, but without success. If someone has the same SW and can run EXE, please could You help me? Thank You in advance. Stepan ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Ing. Stepan Rybar EU Twinning Project CZ 2000-10-01 e-mail: stepan.rybar@taskforce.cz mobil: +420-607-636256 Vinohradska 46/1896, Praha, 120 00 AC: 21756341 ----------------------------------------