Scenario; I open an older document from an unknown source. A warning pops up that I have no substitute for the font, which is Helvetica90ms-RKSJ-H. I go to the "change font" window but am unable to substitute this font for the one on my system, which is Adobe Helvetica. If I try change the character style options default, it defaults right back to Helvetica90ms-RKSJ-H. If I manually change each bit of text (there are dozens in each document, and 200 documents), then copy/paste the fonts into a new document, the new document becomes corrupted and I can no longer choose the font on my system (Adobe Helvetica).
I have even tried an interim method of copy/pasting, by copying to the Windows notepad. That should lose any and all formatting. But when I copy it back to the Illustrator document, it becomes corrupted with Helvetica90ms-RKSJ-H.
Your thoughts are appreciated.