Can't open Bitlocker encrypted files since upgrade to 1809

Self built PC.,
O/S Windows 10 Pro Version 1809 (Build 17763.475)
Processor Intel i7 8700K
Memory 32GB DDR4 2400 Dual
Motherboard Gygabytes AORUS Z370 Gaming K3 Revision # Rev 1.0
Graphics card ASUS GeForce GTX 1070 Turbo 8GB From aria pc 02/06/2018

Since upgrading from Windows 10 Version 1803 (Build 17134.345)
to version 1809 (Build 17763.475) I can no longer access Microsoft Office 2003 Word files encrypted through Bitlocker. Either Bitlocker, or the system, doesn’t recognise either password or Recovery key; I’m being told they’re wrong, despite me knowing both are correct. I upgraded several months ago, but only recently discovered the problem. As I say, it pertains to files, and, so far, I’ve only found answers to Bitlocker problems on drives? I also downloaded a program that claimed it could solve this very problem, but the first thing it asked for was the password or recovery key, which, when entered, the program said was incorrect? Anyhow, if anyone can shed some light on this for me, I will be very grateful.

Geoff Emm

Can you access other encrypted files that are not microsoft Word 2003? Or can't you access any of the encrypted files?

I have only a handful of Word files encrypted via Bitlocker, nothing else, and all are inaccessible. However, I do have encrypted passwords for websites etc., managed by Keepass. They’re kept on a flashdrive that’s also password protected, and all work fine. Prior to creating documents in Microsoft Office 2003, I used Microsoft Office 97. But it’s only since using the 2003 version that I’ve password protected certain Word document files, some of which were created originally in the older suite. I doubt that though, has any bearing; looking at the evidence out on the web, I’m inclined to feel this is a Microsoft issue. Nonetheless, I’ve visited their site, but, dare I say, unsurprisingly, can’t find much if anything relating to my situation. Like I say, there’s plenty of info about encrypted drives, but not individual files.