I've had this problem, too. In my case, it was because Netscape 
automatically un-gzip-ed it for me, but didn't change the extension. You 
may want to do a "file gdb-4_17_gnat_3_11p_alpha-dec-osf4_0d.gz" and see if 
it is an executable.

At 10:18 AM 10/21/99 +0200, Herve Bitteur wrote:
>Since I'm getting into running Ada programs on a DEC/Compaq Alpha machine, 
>I've downloaded the corresponding GNAT version for NYU.
>It works fine for the compiler itself.
>However, the gdb file (gdb-4_17_gnat_3_11p_alpha-dec-osf4_0d.gz) seems in 
>a different archive format than the other *.gz files found on the NYU server.
>I've tried several utilities : tar, gzip and winzip choke on it.
>Who knows which format this is, and (better) which tool I should use ?
>Here is the list of alpha-related files found in the gnat+gdb directories :
>NOT OK : gdb-4_17_gnat_3_11p_alpha-dec-osf4_0d.gz
>OK :            gdbtk-4_17-alpha-dec-osf4_0d_tar.gz
>OK :            gnat-3_11p-alpha-dec-osf4_0d-bin_tar.gz
>Thanks for any clue,
>-- Hervé
>[log in to unmask]
>[log in to unmask]

Victor T. Giddings                          Phone: 703-295-6500
Senior Product Engineer                Fax: 703-295-6501
Objective Interface Systems           [log in to unmask]