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What is a .RAS file?

A RAS file is a Sun Raster bitmap image created by Sun Microsystems in 1986 for SunOS/Solaris workstations. To open it, use GIMP, IrfanView, or XnView — all free and natively supported. The format is obsolete; convert to PNG for everyday use or TIFF for archival work.

Full name: Sun Raster Image File
Category: Raster Image Files
Type: Uncompressed or RLE-compressed raster bitmap (binary, big-endian)
MIME: image/x-sun-raster
Developer: Sun Microsystems (now Oracle)