@ Alanoll : Yes, calling them individually would indeed be the best option, but sadly I don't have the ability to modify the code that executes the first file, it's a routine written by someone else which calls a single reg file of a pre-determined name which can not be changed or it doesn't find it. Thats the best soloution for sure, but I regret it's not an option, but thanks lots for your time and input, I did not know you couldn't call one reg file from another... darn... Sincere thanks to you ! @ jdoe : if you read my second post in this thread, you would have seen that at the moment they ARE merged together in one big long file, however for simplicity of editing just the parts I need, I would have liked to have two files, one for tweaks and one for runonce, so when I come to update this in 6 months and I can't remember what I did, it would be easier to do, I guess I just can't have it that way, no harm in asking tho, right ? @ johann83 : If I didn't want an answer, I wouldn't have asked the question, what I did not ask for however, was your opionions on what I may or may not have needed, a simple 'thats not possible' like Alanoll was kind enough to explain, would have sufficed... I couldn't put it any more simply, how can I call one reg file from another ? Its not rocket science.. my reasons for needing that answer and not an alternative answer are not up for discussion, it was a simple enough question and a simple answer was all I was looking for... @ ZoSTeR : Thanks for that input, I can't really be any more specific, I wanted one reg file to call the other one, but I think Alanoll has infact answered my question with a resounding 'Windows won't let you do that as it's not designed that way'... I can solve this one my self using a multitude of different methods, but none of them were exactly what I was looking for, one file calling the other was... Sadly it can't be done as I intended, as already stated, no harm in asking tho, right ? Thanks to all who posted, and in particular Alanoll, if an admin would be kind enough to close this thread for me, I would be grateful