Are you talking about changing the partitions where suse is actually installed to fat32? If so, I would recommend against this. For starters fat32 doesn't support the same attributes that the linux file systems do - I would expect you to have all sorts of problems with permissions on files.
If you're currently using ext2 or ext3, have a look at Explore2fs
- it allows you to view and retrieve files from your linux partitions. If you're using reiserfs, have a look at http://http://sourceforge.net/projects/visualrfstool/
- it may help.
Of course, if you're talking about re-partitioning, disregard all of this