SBT file extension is for Superbase 4 for Windows, Notes related to record
Similar to SBT
.GP - Glue Geode Parameter File
.GP - Gofer
Project
0 - Compressed harddisk data
DoubleSpace
000 - Common filename extension
GEOS
000 - Compressed harddisk data
DoubleSpace
001 - Fax
Hayes JT FAX many
075 - 75x75 dpi display font
Ventura Publisher
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