Okay, I tried once again. I used the custom installer to install TR, then installed GlideOS v1.48, then installed the special version of Doxbox, invoking administrator rights for these last two steps.

Voila! That worked, but when the game got to the menu ring, it was spinning madly out of control. I do have an Xbox 360 controller hooked up, so I googled how to enable/disable a joystick in Dosbox. Had to add two lines to the dosbox.conf file in the GlideOS folder:

[joystick]
joysticktype=none

That did it. I got the JC custom high-res textures installed, and the MP3 audiopack (had to use administrator rights for this too) and it's working superbly. The only difference now between running this in 64-bit Win7 and 32-bit WinXP is that here full-screen doesn't work, but I can live with that.

Now if only the GlideOS server will let me have another unlock key, I'll be a happy camper.

Well done. Great news. Shame about fullscreen. I have that problem with Redguard, but TR seems fine here.

For more unlocks, just PM me the email address, and I'll sort it.

I just did email you and thanks! I'll be glad to pay again if it'll help. That's not an issue.

I also did sort out the fullscreen issue and am posting it here so that there is at least one complete record of what worked (for me, anyway). To get fullscreen to work, I had not only to check the Fullscreen option in the GlideOS Adjustments menu, but also to add the following in the [sdl] section of dosbox.conf. I reproduce that whole section of my dosbox.conf in its entirety here:

[sdl]
fullscreen=true
output=surface

With those two changes to the installation steps I've described earlier, I have TR1 working perfectly, in fullscreen mode, using GlideOS and the specialized version of Dosbox, in Windows 7 64-bit.

Thanks for the info. What didn't work in full screen. Was it the whole game, or just the FMV scenes?

I'll give those settings a try with Redguard.