I have some files that have
.gid extension. What Mac software should I use to open it?
I use OS X 10.5.8.
It could be a Windows global index file (.gid) or something else completely different depending on where it originated from. If indeed it is the common Windows type, it's used basically tell Microsoft help documents where to position the window on the screen, not much more.
It might be gibberish or it might not; either way you could take a look if you're completely curious. Sometimes unknowingly, mistakenly, or haphazardly, software developers will use .(lll) whatever in relation to the software they've created while another application or computing platform also uses that extension; this can result in confusion, problems and conflicts.
Take a look at this document which lists the most commonly used extensions.
Just because a file is on your computer, it does not follow that the file should be opened by the user at all.
Another kind of file that sometimes has a
With more information about how you came across this file, one might be able to provide a more useful explanation.