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[C5400 v4.20] What's the difference between the RTS Libs?

In CGT v4.20 for C54x processors I see a number of different library names. I know that the _eh suffix refers to a build with exception handling enabled, but I cannot figure out the rest of the names:

-rts500.lib
-rts500_eh.lib
-rts500D.lib
-rts500D_eh.lib
-rts500EXT.lib
-rts500EXT_eh.lib

What does the 'D' and 'EXT' signify? Also, CGT 4.10 had 2 libraries in addition to these labeled rts.lib and rts_EXT.lib. DSP/BIOS 4.90 seems to pigeon-hole me into using one of these two files, so it seems like I cannot use v4.90 (or at least the specific version released with CCSv3.1) with CGT 4.20 unless I link in an RTS library from the old CGT install.

This also brings up the question of "why can't I specify the RTS library inside BIOS" but I will pose this to the BIOS forum after I figure out the naming convention used for the RTS libraries.