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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.os.vms
Subject: Re: Never Got Used To Those New-Fangled VMS Filename Extensions ...
Date: Sun, 28 Jul 2024 21:53:26 -0000 (UTC)
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On 28 Jul 2024 15:14:17 -0400, Rich Alderson wrote:

> TOPS-20 (based on TENEX) used the .EXE extension on sharable
> executables, although TENEX used .SAV on both sharable and nonsharable
> executables.  Tops-10 used .SAV (or .LOW and .HGH for executables with a
> sharable segment), until late in the game when TOPS-20 style sharable
> executables came to Tops-10.
> 
> I believe that RT-11 got .EXE from the larger systems.

I think the significance of .SAV was that it was essentially a straight 
memory dump, so loading it into memory was very simple. Whereas .EXE 
required a bit more setup.