K10MSG.BLI is KERMSG.BLI. This is the common Bliss KERMIT message module, and is identical for KERMIT-10 and KERMIT-32. When building KERMIT-10 from the Bliss source files, you may use VMSMSG.BLI (renamed to KERMSG.BLI) as the source for the message module for KERMIT-10 as well as KERMIT-32.