How to make a shell script runnable?

[Wei Xiang]

I am using B19 in Windows 98 platform.  But I can not use the chmod command
to change a file's attributes.  Why?  Your suggestion will be very helpful
to me.

Here is a test:

drwxr-xr-x   3 500      everyone        0 Sep  1 15:05 .
drwxr-xr-x   0 500      everyone        0 Jan  1  1970 ..
-rw-r--r--   1 500      everyone        3 Sep  2 09:42 a
BASH.EXE-2.01$ chmod +x a
BASH.EXE-2.01$ ls -al a
-rw-r--r--   1 500      everyone        3 Sep  2 09:42 a
BASH.EXE-2.01$ chmod 777 a
BASH.EXE-2.01$ ls -al
total 1
drwxr-xr-x   3 500      everyone        0 Sep  1 15:05 .
drwxr-xr-x   0 500      everyone        0 Jan  1  1970 ..
-rw-r--r--   1 500      everyone        3 Sep  2 09:42 a
BASH.EXE-2.01$
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