Looking at the modo support in DL 5.x, I see this in the format files under scripts/Submission/ModoSubmission/. I wonder how these files are defined (there are no comments). Does this correspond to some internal aspect of the modo install?
$FLEX|flx|0|0=Flexible Precision FLX
$Targa|tga|1|1=Targa
BMP|BMP|1|1=Windows BMP
HDR|hdr|0|0=High Dynamic Range HDR
JP2|jp2|0|0=JPEG 2000
JP216|jp2|0|0=JPEG 2000 16-Bit
JP216Lossless|jp2|0|0=JPEG 2000 16-Bit Lossless
JPG|jpg|1|1=JPEG
PNG|png|1|0=PNG
PNG16|png|1|0=PNG 16-bit
PSD|psd|0|0=PSD
SGI|SGI|1|0=SGI RGB
TIF|tif|1|0=TIF
TIF16|tif|1|0=16-Bit TIF
TIF16BIG|tif|1|0=16-Bit Uncompr. TIF
openexr|exr|1|0=OpenEXR 16-bit
openexr_32|exr|1|0=OpenEXR 32-bit
openexr_tiled|exr|1|0=OpenEXR Tiled 16-bit
openexr_tiled32|exr|1|0=OpenEXR Tiled 32-bit
LayeredPSD|psd|0|0=LayeredPSD
PNGs|png|0|0=Multi-file PNG Layers
PNGs16|png|0|0=Multi-file 16-bit Layers
openexrlayers|exr|1|0=Layered OpenEXR 16-bit
openexrlayers32|exr|1|0=Layered OpenEXR 32-bit