Hello Everyone I need open open so many asc files (esri ascii format), but no found ENVI_OPEN_DATA_FILE.. which will be the right choice...... ENVI_OPEN_DATA_FILE, Fname [, /ACRES] [, /ADRG] [, /ALOS] [, /ASTER] [, /ATSR] [, /AVHRR] [, /BMP] [, /CADRG] [, /CIB] [, CORRECTED_SRTM_OUT_NAME=filename] [, /COSMOSKYMED] [, /DIMAP] [, /DMSP] [, /DOQ] [, /DRG] [, /ECW] [, /ENVI] [, /ENVISAT] [, /EOSAT_IRS] [, /EOSAT_TM] [, /ERMAPPER] [, /EROS_1A] [, /ERS] [, /ESA_SHARP] [, /ESA_TM] [, /ESRI_GRID] [, /FORMOSAT2] [, /HDF_SD] [, HDFSD_DATASET=value] [, HDFSD_INTERLEAVE={0 | 1 | 2}] [, /IMAGINE] [, /IRS_SUPER] [, /JERS] [, /JP2] [, /JPEG] [, /KOMPSAT2] [, /LANDSAT_METADATA] [, /MAS_50] [, /MRLC] [, /MODIS] [, /MRSID] [, /NITF] [, /NLAPS] [, /PCI] [, /PDS] [, /PICT] [, /PNG] [, /QB_TILE], R_FID=variable [, /RADARSAT] [, /RAPIDEYE] [, /SEAWIFS] [, /SPOT] [, /SRF] [, /SRTM] [, /TIFF] [, /TFRD] [, /TIMS] [, /TOPSAR] [, /WV_TILE] [, /XWD] thanks in advanced. bye