h6. [[Programmer's Reference Manuals]] h6(. » [[Service Calls]] h6((. » Service_LookupFileType h2. Service_LookupFileType h5. (Service &42) |_<^{width:4em}. Entry | | |<^. R1 |<^. 66 (&42)| |<^. R2 |<^. [[File Types|Filetype]]| |_<^{width:4em}. Exit | | |<^. R1 |<^. 0 to claim service (filetype known), else preserved | |<^. R2 |<^. First four characters, if known| |<^. R3 |<^. Last four characters, if known| h4. Use This service is issued when a filetype lookup in the <code>File$Type_XXX</code> variable fails. h4. Notes This service call has limited use, as System Variables are more useful. h4. See also * [[Service Calls]]