file extension is not valid excel

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
file extension is not valid excel	0.83	0.9	1010	29	33
file	0.53	0.1	7600	100	4
extension	0.26	0.7	7853	99	9
is	0.45	0.7	3612	51	2
not	1.67	0.3	7063	33	3
valid	1.02	0.4	6910	21	5
excel	1.17	0.1	8307	41	5

Keyword	CPC	PCC	Volume	Score
file extension is not valid excel	0.63	0.5	8247	55
excel file format or file extension not valid	1.15	0.4	9624	23
file format or extension is not valid excel	0.01	0.3	8595	91
excel cannot open file extension not valid	1.62	0.5	9076	80
excel file extension not valid or corrupt	0.2	0.1	133	43
excel file format is not valid	1.98	1	3033	1
file format is not valid excel xls	0.66	0.6	9491	29
microsoft excel file format is not valid	0.29	0.1	7621	82
excel file extension is not valid error	0.18	0.1	4974	96
excel file extenstion not valid	0.19	0.2	5228	10
excel error file format is not valid	1.17	0.1	9452	83