private boolean isMarkdownFile(String file)
{
FileSystemItem fsi = FileSystemItem.createFile(file);
FileTypeRegistry ftReg = RStudioGinjector.INSTANCE.getFileTypeRegistry();
FileType fileType = ftReg.getTypeForFile(fsi);
return (fileType != null) &&
(fileType.equals(FileTypeRegistry.MARKDOWN) ||
fileType.equals(FileTypeRegistry.RMARKDOWN));
}