• Invalid header or bad magic number [INTERNAL 10011]
• IRef not found in IRefRes table: skipping [INTERNAL 10012]
• Skipping file: Error parsing submodel [INTERNAL 055]
• Skipping file: File contains no records [INTERNAL 059]
• Skipping file: File too short [INTERNAL 058]
• Skipping file: OpenDesign Exception [INTERNAL 052]
• Skipping file: Possibly corrupt A/B PLC file [INTERNAL 057]
• Skipping file: Unable to read file [INTERNAL 054]
• Skipping file: Unknown M1/M2 file type [INTERNAL 056]
• Unknown Exception [INTERNAL 053]

The error types in this file that have not yet been converted are documented here:

Other examples of these messages are listed below. These messages identify a file that we cannot process. Please send us a copy of it if it has no apparent problems in your system.

Note: if the file DBDOC-CHECK_FILE_OPEN_FAILURE is also present, sometimes they may both be resolved if the project is rebuilt from the Wizard stage.

Blank MTEXT record on line nnnn -- skipping
Skipping database TRUSAGE.DBF
Non-local exit from file D:\U1TOPBAR.m1
Invalid magic number ... corrupt file will be skipped
Can't find file .tif: O/S Error 87