Recovering dmg files from HDD just reformatted to FAT32 (oops!)

Hi folks,
I had a OSX format external HDD which was just inadvertently erased via Disk Utility to FAT32.
It had a number of dmg disk images on it I'd like to recover, some are 1gb up to 70gb.
I'm trying FileSalvage which is slowly scanning the disc, but it doesn't seem obvious whether it will recognise and recover dmg files?
Any tips?
B

TestDisk does look promising, but if I follow the steps in the appropriate example, I don't get the 'choose boot' option referred to - I'm also not entirely sure I'm selecting the right partition map or filesystem (what would it call Apple Partition Map, or GUID; or OSX Extended?).
Cheers,
B
http://www.cgsecurity.org/wiki/DataRecoveryExamples
If the partition has been reformated to another filesystem (FAT32 formated as NTFS or vice-versa),
-run TestDisk,
-select the harddisk, the partition type
-choose Advanced
-select the partition
-choose Type,
-enter the value corresponding to the previous filesystem
-choose Boot
-choose RebuildBS
-List
I-f you can see your files, choose Write and confirm
-In Analyse, choose to rewrite the partition with the correct partition type.
-Return to TestDisk main page

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