Tom, hi
1. I don't know why WS5 has the tag file option greyed out. You should be able to create and save a tag file and then select and load it.
2. Usually tags are right next to the word they apply to (as are yours), preferably to the left (not the right).
3. I think you want to search on tags (as you are doing), not on any other search word. Something like <m-*>, that should work.
4. You pointed me usefully to another query from a user needing WS7, so I guess that answers point 1. I cannot fix any version below 9 now.
5. XP is unsafe re hacking etc, best not to use it. If you have to, WS8 might work. WS9 (the current 64bit version won't I think as there are functions that call on resources in Windows 7 or better.) I will email you a one month licence for WS8 for you to try. You can try that on your XP computer, or else install on a memory stick and take it to a friend's more up to date PC....
Cheers