Macro - Export - File Types

Hey All,

So here is my situation. I have a working export macro which just exports a tiff of my current isodraw drawing. However from time to time I'll export a drawing and forget it, then run a batch export macro on an entire folder and my macro will take that tiff image that i forgot about and overwrite my vector art with the raster tiff. Is there a way for my macro to only recognition .iso files? or not export the .iso if a .tiff of the same name already exists? Or if anyone else has any suggestions, thanks in advance

- Justin