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Affymetrix GeneChip® Software Platform
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What about data compatibility between MAS v.5.1 and GCOS v.1?
Affymetrix has maintained full forward and backward data compatibility between GCOS v.1 and MAS v.5.1. The following table summarizes file compatibility between the two software products.

MAS GCOS Client GTYPE/GSEQ
Create: Create: Create:
DAT DAT CHP (DNA analysis)
CEL CEL FASTA
CHP CHP (expression)  
EXP CAB (export)  
RPT, TXT RPT, TXT (export)  
Analyze: Analyze: Analyze:
DAT DAT CEL (GCOS)
CEL CEL