These guys say its safe
https://www.reasoncoresecurity.com/libtdidll.dll-54a292a0ad4dd400eeb100b6d1121f6e5ddad72e.aspx
So its probably a false positive. Been meaning to find and post on the Avira forums but forgetting – if anyone else gets there first let us know
Annoying though as every now and then Avira will forget that you told it to ignore the file and go back to quarantining it again, disabling the EyeX until you manually un-quarantine again