Bug 154803 [regression]Cannot render document to user defined path through __document parameter
Description: Cannot render document to user defined path through __document parameter Steps to reproduce: 1. Preview a report in viewer 2. Modify url to add "__document=c:/tmp.rptdocument", this will generate report document to c disk with name "tmp.rptdocument" 3. Press enter. Expected result: Report displays correctly and the document is created. Actaul result: The document file : c:/tmp.rptdocument does not exist or contains errors.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java
new String[]{this.reportDocumentName} );
				else
					this.exception = new ViewerException(
							ResourceConstants.GENERAL_EXCEPTION_DOCUMENT_ACCESS_ERROR,
							new String[]{this.reportDocumentName} );
				return design;
			}
			
			if ( !ParameterAccessor.isValidFilePath( this.reportDesignName ) )
			{
				this.exception = new ViewerException(
						ResourceConstants.GENERAL_EXCEPTION_REPORT_ACCESS_ERROR,
						new String[]{this.reportDesignName} );
			}
			else
			{
				try
				{
					
					File file = new File( this.reportDesignName );
					if ( file.exists( ) )
					{
						reportRunnable = ReportEngineService.getInstance( )
								.openReportDesign( this.reportDesignName,
										this.getModuleOptions( request ) );
					}
					else if ( !ParameterAccessor.isWorkingFolderAccessOnly( ) )
					{