File permissions - append only

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File permissions
I want to know how to make a file "append only" ( and read, but that is no
problem)
The "append data" setting seems useless, or at least I cannnot get it to work.

If I have "write data" allowed, I can open a file for write, read/write,
append, or append/read and write successfully.
(I am doing this in C with fopen("filename", "w" ) and "w+", "a", "a+"
parameters )
If I have "write data" denied, I cannot open the file in any of these modes.
The windows API for CREATEFILE mirrors the information as shown in msdn for
the various permissions.
I am left wondering just what the append setting does ...


I want to set a log file so that the users can append to it but not alter
the contents that already exist (i.e. append only) but do not see a way to
make it work.

Happy holidays,
-Mark