I have Mandrake 9.2 and GeForce 4 MX440 and it works fine with 24bit.
I'm not sure about RH 7.3, since I haven't installed it on this machine, but I think it should run also, ....if not, you can definetely try Mandrake for IC50....for me the installation went flawlessly....also, Mandrake is easier to use than RH7.3 and even looks better .
Good luck!
Probably you are talking about .cshrc . This file is somewhat similar with autoexec.bat in DOS. .cshrc is the startup file for the C shell. Each time you open a console, if C shell is your shell, the instructions found in this file will be executed. So, here you would set some variables needed by IC to work, also you would set the path towards the executable file in IC etc etc
For more information, check this topic I wrote about IC installation:
Also, you should do a search in this forum before asking questions, there are a lot of problems that already have responses. For me it was of great help, after reading through this board for a day I was able to install IC without asking a thing.
And also, you should be more specific if you want help....not say "I need some csh file...."... I think people here have better things to do than to guess your problem .