As wess666 said: those three codes match the applied CSC files applied to that given zip file. MCT is indeed for Mobilicity. And if you're wondering why Wind has GLW, prior to rebranding the company was known as Globalive Wireless.
On the "big three" side, you'll see BMC (Bell) BWA (Bell Wireless Alliance, aka Aliant) RWC (Rogers) TLS (Telus) VMC (Virgin Mobile, which is interestingly present in the I317M files). Other Canadian CSC codes you might see: PCM (President's Choice) KDO (Koodo). I'm probably missing one or two other MVNOs but that's about it.
Do you care about the flash counter? If yes, tread carefully with what you flash. MrRobinson's pre-rooted stock ROM flashed via Odin will work, or perhaps even easier Chainfire's ExynosAbuse apk (available here on XDA) will work on the stock T889V 4.1.1 ROM.
If you don't care about the flash counter, you could also root by first flashing CWM or TWRP with Odin then applying the superuser zip of your choice, or just flashing something pre-rooted from there.
Do not flash any modems. Even the T889V one.
Do not flash ROMs meant for the N7100.
ROMs and kernels for the N7105, I317, I317M, T889 and T889V are generally compatible.
I've checked the XXDMB3 Odexed zip posted by teshxx and it still has the Singapore CSC files as well as a build.prop set for N7105.
I'm downloading his stock zip factory image to check it out, but I'd rather go the Odin route if I'm going to be restoring completely back to stock. With the exception of retarring the image minus the modem in our specific case. (See reports of bootloops after flashing the T889V modem over itself.)