DOS computers use three-digit extensions; Acorn machines with Risc OS 3.x can use the DOSMap command to automatically show DOS files with Acorn filetypes.
Here's what Risc OS 3.50 has to say about this command:
==> Help on keyword DOSMap
*DOSMap specifies an MSDOS extension to RISC OS filetype mapping. The RISC OS filetype can be given as either a 12bit HEX ASCII number or as the text identifier defined by a suitable File$Type_XXX variable. If no RISC OS filetype is given, then the existing MSDOS extension (if present) will be removed. If no parameters are given then the current mappings are displayed.
What this means is that if you type *DOSMap TXT FFF, any DOS file with an extension in the form "FILENAME/TXT" will show up as being a text (&FFF) file. *DOSMap TXT will remove the definition *DOSMap TXT FFF. Simply typing *DOSMap will show all the currently defined maps.
Here are one or two of my own maps, not guaranteed to be accurate but at least better than seeing all those confusing DOS icons when you bring up a disc window!
DOSMap ARC DDC (archives)
DOSMap TXT FFF (text)
DOSMap DOC FFF (documents in text format)
DOSMap WAV FFD (sound samples)
DOSMap EPS FF5 (postscript files)
DOSMap MOD CB6 (Tracker music file)
DOSMap ZIP DDC (archive file, use Spark)
DOSMap PFB FF5 (Adobe Type 1 font file; T12Font needs this)
DOSMap AFM FFF (Adobe Type 1 font file; T12Font needs this)
DOSMap MPG BF8 (MPEG movie)
DOSMap AVI FB2 (AVI movie)
DOSMAP HTM FAF (HTML page)
DOSMAP HLP FFF (Help file in text format)
DOSMAP ME FFF (For text files called READ/ME)
You can also use names instead of hex numbers; but make sure they have been defined first!
Set File$Type_FF9 Sprite
Set File$Type_FF0 TIFF
Set File$Type_FC9 SunRastr
Set File$Type_FD5 PICT2
Set File$Type_C85 JPEG
Set File$Type_690 Clear
Set File$Type_692 IMG
Set File$Type_693 AmigaIFF
Set File$Type_694 MacPaint
Set File$Type_695 GIF
Set File$Type_697 PCX
Set File$Type_69C BMP
Set File$Type_69D Targa
Set File$Type_69E PBMPlus
Set File$Type_6A2 ColoRIX
DOSmap PCX PCX
DOSmap PCC PCX
DOSmap BMP BMP
DOSmap DIB BMP
DOSmap RLE BMP
DOSmap PBM PBMplus
DOSmap PPM PBMplus
DOSmap PGM PBMplus
DOSmap PNM PBMplus
DOSmap SUN SunRastr
DOSmap RAS SunRastr
DOSmap TGA Targa
DOSmap VDA Targa
DOSmap ICB Targa
DOSmap BST Targa
DOSmap TIF TIFF
DOSmap SEP TIFF
DOSmap CMY TIFF
DOSmap GIF GIF
DOSmap PNT MacPaint
DOSmap MAC MacPaint
DOSmap IMG IMG
DOSmap GEM IMG
DOSmap IFF AmigaIFF
DOSmap HAM AmigaIFF
DOSmap HBR AmigaIFF
DOSmap LBM AmigaIFF
DOSmap RIX ColoRIX
DOSmap SCF ColoRIX
DOSmap SCI ColoRIX
DOSmap PCT PICT2
DOSmap JPG JPEG
DOSmap JIF JPEG
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