sorry - it is confusing.
I have installed Win 7 as the NTLDR and NDETECT files were corrupted on Win XPsp3.
The opsys install was to a different harddrive and I left the WinXP install intact. WinXPsp3 has Opera 12 or whatever is the latest version before 21.
I installed Opera 21 onto the Win7 environment.
It did not detect nor install the earlier version Opera bookmarks or anything else from the redundant version. I did not expect it to do this, however I could not see how to transfer the bookmarks from the earlier version to the new version 21. I can locate the .adr file in the directory established by Opera v12.0. If I only have to copy this file over then I can do that but to which Target directory in Opera 21 install?
The Opera (Customize and Control) button / More Tools / Bookmark Importer link is not live on the version 21 Opera installed under Win 7 on my machine and I cannot find any way to transfer from the earlier to the latest.