CAR Archive (Compressed Archive) by MylesHi! Software
This association is classified as Archive. The identifying characters used for this association are - Hex (position 2): 2D 6C 68 35 2D , ASCII: -lh5- Related links: CAR v1.50 Archiver
CardMaker (Ver. 1.0-2.0 Card File) by Avery
Carnivores / Ice Age (Resource File) by Action Forms, Ltd.
Graphics, animations, and sounds for animals, weapons, and objects. This association is classified as Archive. Related links: Fan Site, File Format, Fan Site
Carrara (Environment) by DAZ Productions
The identifying characters used for this association are - Hex: 33 44 43 20 7B , ASCII: 3DC.{
Cellsprings/Web or DT (Rule File) by J.M.G. Elliott
Cellsprings/Web is a general 2D cellular automaton explorer implemented as a Java 1.1 applet. The identifying characters used for this association are - Hex: 43 41 52 75 6C 65 , ASCII: CARule Related links: Cellsprings File Format
Creatacard (Quarter-Fold Card Project) by Broderbund
Design-Your-CD (Data File) by Avery
I suppose it would be silly to suggest that you tell the person who forwarded it you to ask the original sender what software it was created in and whether they can export in a more universal format for them?