With Filestar you get 218 different skills for working productively with Portable Any Map Image .(pnm) files.
About .Pnm
Name
Portable Any Map Image
Extension
.pnm
Format
Binary
Category
Raster Image
Developer
Jef Poskanzer
Description
Bitmap image created in the Portable Any Map format, which was designed to handle several types of portable monochrome, grayscale, and color images; may include raster graphic data in a .PBM, .PGM, or .PPM format; may be stored using binary data or ASCII text.