Well, after a LOOONNNNGGGG time, I finally got my Mac files modified so I can transfer them to Quicken for PC. BTW, I'm using Quicken for Mac
2004 and Quicken for PC 2004.
The main source of problem is that I had used the Action "MISC" many places, and when those transactions moved to Quicken for PC, the amounts were left blank. Further, you couldn't even edit those transactions to add the left out amounts.
So, I finally bit the bullet and changed every "MISC" entry to either "XFR" or "DIV" or "DEP". Then the transactions were accepted in the Quicken PC.