[Qgis-developer] not able to install "QGIS-1.3.0-3-No-GrassSetup.exe"

[sam sam]

Dear all,
I downloaded "QGIS-1.3.0-3-No-GrassSetup.exe".
But not able to install, its giving following error.

"QGIS-1.3.0-3-No-GrassSetup.exe"  is not a valid win32 application.

help required,

sam
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