If it is Shapefile, you can open DBF file in LibreOffice/OpenOffice Calc, and
change field type (field type is represented by symbol (N, C, D or M) by the
field's name), for example:
FIELD,N,9,0

to:

FIELD,C,9

N is for Number (numbers define field's Length and Precision), C is for
Character, D is for Date, M is for Memo.


You should make a backup of DBF file before. It is faster method, but you
should be careful with using it.

Regards,
Saek Binko



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