How do I load an XML file, and save it as an fm file

Hi Experts,

I have a bunch of XML files in a folder. What I'd like to achieve is that, I'd like to iteratively load the xml using a StructuredApplication and save it as an FM file. I've been able to sucessfully load the XML file but I'm having difficulty in saving it as an FM file.

Here is the code that I've written so far:

if (sourceFolder != null){ // If a valid folder is selected

    files = new Array(); 

    fileType = "*.xml"; 

    files = sourceFolder.getFiles(fileType);  // Get all files matching the pattern 

    if (files.length > 0) { // Get the destination to save the files 

        destFolder = Folder.selectDialog( 'Select the folder where you want to save the converted XML files.', '~' );

        for (var i = 0; i < files.length; i++) { 

            // Set the options for opening the XML file.

            var openParams = GetOpenDefaultParams();

            var j = GetPropIndex(openParams, Constants.FS_OpenAsType);

            openParams[j].propVal.ival = Constants.FV_TYPE_XML;

            j = GetPropIndex(openParams, Constants.FS_StructuredOpenApplication);

            openParams[j].propVal.sval = "XML snpsbook";

            j = GetPropIndex(openParams, Constants.FS_FileIsOldVersion);

            openParams[j].propVal.ival = Constants.FV_DoOK;

            j = GetPropIndex(openParams, Constants.FS_FontNotFoundInDoc);

            openParams[j].propVal.ival = Constants.FV_DoOK;

            j = GetPropIndex(openParams, Constants.FS_FileIsInUse);

            openParams[j].propVal.ival = Constants.FV_DoCancel;

            j = GetPropIndex(openParams, Constants.FS_AlertUserAboutFailure);

            openParams[j].propVal.ival = Constants.FV_DoCancel;

            var  returnParams = new PropVals();

           // I'M NOT ABLE TO GET THIS LINE TO EXECUTE. sourceDoc RETURNS AN INVALID OBJECT REFERENCE.

            sourceDoc = Open(files[i].name, openParams, returnParams);  // Return the document object

            alert(sourceDoc.name);

            // Function to save .XML file to .FM extension

            var saveParams = GetSaveDefaultParams();

            var returnParamsp = new PropVals();

            // Replace the .xml extension with .fm

            var k = GetPropIndex(saveParams, Constants.FS_FileType);

            saveParams[k].propVal.ival = Constants.FV_SaveFmtBinary;

            saveAsName = sourceDoc.name.replace (/\.[^\.\\]+$/,".fm");

            var saveInFile = Save(saveAsName, saveParams, returnParamsp);  // Save as .fm file

            saveInFile = new File ( destFolder + '/' + targetFile);

            saveInFile.close();  // Close file

        }

        alert('Files are saved as FM in ' + destFolder); 

    } else { 

        alert('No matching files found!!!'); 

    } 

}