SYMPTOM:
Long text is truncated to 255 characters when a report with an Attribute Form Category set to ID and Format Type set to Text is exported to Excel with Plain Text from Strategy Web 9.x.
In the picture below, notice the =T(" character string is exported with the truncated text:

STEPS TO REPRODUCE:
CAUSE:
This issue is caused to due to a known issue in Strategy Web 9.x and it is not related with the presence of special characters in the report result.
WORKAROUND:
Perform one of the following options in order to export a report to Excel with no truncated strings:
NOTE: Refer to the following Technical Note for further information on a similar issue in Strategy Developer: