I'm interested in buying this. Haven't been able to find it in years and loved it as a kid.
I'm worried though that I recently tried reinstalling some of my late 90s-2000s era games and they so drastically screwed with my Win7 that I nearly had to reformat and start over just to get things like Windows Media Player to work correctly again.
I'm new to GOG but there are many of my old favorites, particularly this the original IWar. (In fact one of the games I tried installing was IWar 2 and it had some bizarre issues). I'm worried that I'll run into the same problems and it looks like some people have gotten this to work in Win7 64bit while others have had problems.
So once I download this (I haven't bought it yet mind you), what do I need to do in order to get this working? I've kept my drivers and windows up to date so shouldn't have any problems due to things being too old.

Hi.
A quick glance through the board seems to show that you'll probably have to edit the glide_wrapper.zbag.ini in the \AppData\Roaming\
folder and set the option high_res to 1 to sort out the scaling.
And 'Disable Visual Themes' and 'Run as Admin' applied to the game's shortcut definitely won't hurt.
Other than that it's really hard to make a guess regarding exactly what you'll have to do at your end, if anything at all.

I'm running the game on Win7 64, and the only annoying problem I've got now is some of the movies blurring.
Other than that all I had to do was alter that glide wrapper option to fix the scaling.
You can use the dgVoodoo wrapper instead which fixes the blurring movies, but I found that wrapper tended to crash randomly when in combat.
So there's no a lot you have to do to get it working - it either works or it doesnt!

Well, I went ahead and bought it ($5 for the most amazing starship combat this side of Homeworld - the only question was will it work). Downloaded it, ran the installer, went with someone's advice elsewhere on here to install it somewhere that isn't Program Files (x86) and instead just installed it in C:\GOG\Independence War Deluxe
I did absolutely nothing else. Decided to run it for the error message it would spit at me but to my delight I was treated to the long and awesome opening video. Although it definitely shows its age graphically, I'm nostalgic for the level of badassery and brilliant combat in a PC game that was just generally great storytelling.
Bottom Line: the game worked great. No problems. I'm officially sold on GOG. I fully expected this to be a horrid trainwreck of Compatibility Mode and Registry Editing but nope. Worked right out of the box... er installer.

That's what GOG do - make the games work as best they can on modern hardware. I'm very happy to be able to play the game I worked on over 10 years ago without having to jump through loads of hoops to get it working.
GOG have performed a miracle considering how hard it was to get this game working on modern PCs.