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Samba HowTo Guide
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Explicitly Enable “raw” Printing for application/octet-stream

If you use the first option (drivers are installed on the client side), there is one setting to take care of: CUPS needs to be told that it should allow “raw” printing of deliberate (binary) file formats. The CUPS files that need to be correctly set for raw mode printers to work are:

  • /etc/cups/mime.types

  • /etc/cups/mime.convs

Both contain entries (at the end of the respective files) that must be uncommented to allow RAW mode operation. In /etc/cups/mime.types, make sure this line is present:

application/octet-stream

In /etc/cups/mime.convs, have this line:

application/octet-stream   application/vnd.cups-raw   0   - 

If these two files are not set up correctly for raw Windows client printing, you may encounter the dreaded Unable to convert file 0 in your CUPS error_log file.

Samba HowTo Guide
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