OniUnPacker

OniUnPacker (or OUP)

Features in 0.24a:

• View, edit, import and export the data of the files in the .dat and .raw (with little helpers as a ValueViewer and the StructureViewer) easily
• Extract ONI's data
• Preview TXMPs (textures), TXANs (texture animations), TXMBs (big image maps (as far as I know they are only used for the intro/outro splashscreens and the backgrounds in the menus))
• Replace TXMPs with normal 24bit bitmap-files (and TXMPs are converted to this format while extracting too)

You can always get the newest release at http://chrilly.net/oup/.

Some screenshots

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Example of replaced texture files

Replaced all of the fire*-textures in level4/airport assault with an test-bitmap and set transparency to 1