[]PHP执行系统命令失败

<br />exec("c:/Program Files/IrfanView/i_view32.exe c:/Program Files/IrfanView/03280009.sff /convert=c:/Program Files/IrfanView/4.tif", $result, $status); <br />echo $status;<br />

<br />exec("c://Program Files//IrfanView//i_view32.exe c://Program Files//IrfanView//03280009.sff /convert=c://Program Files//IrfanView//4.tif", $result, $status); <br />echo $status;<br />

<br />exec("c:\Program Files\IrfanView\i_view32.exe c:\Program Files\IrfanView\03280009.sff /convert=c:\Program Files\IrfanView\4.tif", $result, $status); <br />echo $status;<br />

<br />exec("c:\\Program Files\\IrfanView\\i_view32.exe c:\\Program Files\\IrfanView\\03280009.sff /convert=c:\\Program Files\\IrfanView\\4.tif", $result, $status); <br />echo $status;<br />