Friend sent me a copy of his MSQ (taken from TS) by email. The attachment had the icon of a MegaTune file. I do have both MegaTune and TS on this desktop. Right clicking on the file and 'open with' didn't initially give the choice of TS. Added it, and made that the preferred one. The Icon changed, but not to a TS MSQ one. And clicking on it didn't make TS run.
Loading TS then the file made it open as normal, with the option of using the test project.
I've had this before when clicking on an MSQ file uploaded to here. Probably to do with Windows love of secrecy when it comes to file types.
Is there an easier way of correcting this if it happens again?