RLA
The Wavefront RLA (Run-Length Encoded Version A) image file format is used to store three types of data:
-Graphics images
-Field-rendered images captured from live video
-Three-dimensionally rendered image data (including Z-depth channel)
RLA is certainly a well know format. It is great for composition work (ie: Adobe After Effects). "Rendering to the .RLA format is the most amazing thing since sliced bread" said Rober Stava from Arup 3D media Group.
PIC
A widely used format for interchange of data, primarily business graphics. Somewhat dated. Big-endian in format, although originating under MS-DOS on Intel-based machines.
tx1, tx3 ...
Someone posted some info about these texture. Search back. There is nothing special with them, except that are used as normal textures, bump textures and so on. You can use any format (jpeg, bmp, tiff, tga) you like insted of tx1, tx3....
-Hora