Dual Boot issues please help

i have a 2012 macbook pro that was dual booting windows running on a separate hd (replaced the disk drive) but i had to reinstall mac os and open corecon my main hd now my computer wont boot into the windows. The data is still there, but it won't treat it like a bootable hard drive. Is there anyway I can fix this please help.

submitted by /u/silverwings741
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