Rockwell Automation 9323-S5500D A.I. SERIES MICROLOGIX 1000 AND PLC-500 SOFTW - Manual (Page 500)

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PLC-500 A.I. File Extensions
The following table shows the file extensions for files created by PLC-500 A.I.
File Extension Type of File
ACH Ladder logic
ADR Index for description text
ATT Global/local attach mode data
CDL Custom data monitor screen (v8.03 and higher)
CFG Program configuration data
CNT Table of contents
DEL Deleted unused instruction descriptions (ASCII delimited format)
DSC Instruction description text
ERR Error messages
FIX Fixup information for a block of rungs
HEX EEPROM files
IB1 Compressed backup of project
LBL User defined wire labels
LIB Blocks of rungs saved to disk (old format, no longer used)
NAM Subroutine names (not descriptions)
PRF Program revision history file
RCF Report configuration
RPD Rung/page database
RPI Index for rung/page database
SCR Custom data monitor screen (versions prior to v8.03)
SLC Blocks of rungs saved to disk (new format)
SY5 Symbol library for .SLC file
SYM Index for symbols
TCH Temporary .ACH (can delete)
TTL User title page for reports
TXT Database export to APS text format