Firmware Update for Mac?

I have a SanDisk ImageMate 5 in 1 Reader.  When I insert my older 512 MB card iPhoto opens immediately.  However, with my new 8 GB SD HC card the computer doesn’t seem to read that anything is in the reader.  I tried downloading an updated version, but it was an exe. file.  How do I get my card reader to register the new card for a Mac?

You probably need a newer card reader that supports the SDHC format.