Thanks, Allan!
Based on your excellent feedback, I was able to determine the problem.
When a file is w/o extension TextMate (heuristically) scans to see if it's text, and if so, opens the file. So README and INSTALLATION should give you no problems.
The problem was a 0x0C character (signifying a page break).
I'll try to make it more liberal wrt allowing control characters in text.
Thanks!
[...] "file" give the same result for both files: "Bourne shell script text executable".
That's not based on the file extension.
A bit off-topic. I'm aware of that. In fact, I would not recommend using the output of "file" for a decision, since it is based on the "magic" file, and I have found that this magic file can differ considerably between installations.
Regards, Freek