Bug 36867 [Import/Export] Zip export dialog not append .zip if there is already an extension
Sometimes, when the Jar export dialog doesn't have the options I want, I use the zip export dialog to build a jar. Unfortunately, if I specify a file name of foo.jar, the zip export dialog insists on adding ".zip" to the end of the file name. Would it be possible to make it so ".zip" is not automatically added if there is already an extension on the file name (or specifically if ".jar" is there)? Or could there be a checkbox added on the export dialog to turn off the automatic appending of .zip?
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/wizards/datatransfer/WizardZipFileResourceExportPage1.java
protected boolean executeExportOperation(ZipFileExportOperation op) {
		op.setCreateLeadupStructure(
			createDirectoryStructureButton.getSelection());
		op.setUseCompression(compressContentsCheckbox.getSelection());
		try {
			getContainer().run(true, true, op);
		} catch (InterruptedException e) {
			return false;
		} catch (InvocationTargetException e) {
			displayErrorDialog(e.getTargetException());
			return false;
		}
		IStatus status = op.getStatus();
		if (!status.isOK()) {
			ErrorDialog.openError(getContainer().getShell(), DataTransferMessages.getString("DataTransfer.exportProblems"), 
			null, 
			status);
			return false;
		}
		return true;
	}
	/**
	 * The Finish button was pressed.  Try to do the required work now and answer
	 * a boolean indicating success.  If false is returned then the wizard will
	 * not close.
	 * @returns boolean
	 */
	public boolean finish() {
		if (!ensureTargetIsValid())
			return false;