schleep - Monday, October 23, 2017 8:19 AM
It sounds like it's just pointing to the 2008 version. Check this link and see if it helps - has some solutions for the same issue:
Opening .sql files in SSMS 2012 as default program and with existing instance
I use FileTypesMan from NirSoft as I can view a lot more of where things are pointing - especially for multiple apps like SSMS:
FileTypesMan
Sue