Download problem in ALV

Hi,

For ALV data dispaly using "REUSE_ALV_FIELDCATALOG_MERGE" am generating fieldcatalog and in report i can see the full description of field headings by stretching that columns.But when i downloaded into excel the field headings are suppressed i checked in Standard ALV are same like this.But what is the possible way to get fll description of that headers of fields in Excel.

THX