how to fix xls file format is not valid

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
how to fix xls file format is not valid	0.1	0.8	4498	59	39
how	0.21	0.4	1289	45	3
to	0.46	0.3	8681	47	2
fix	0.36	0.2	9531	89	3
xls	0.59	0.3	7793	7	3
file	1.08	0.8	8793	73	4
format	0.6	0.8	7088	10	6
is	1.64	0.5	1519	51	2
not	1.8	0.5	9903	39	3
valid	0.66	0.9	3209	3	5

Keyword	CPC	PCC	Volume	Score
how to fix excel file format is not valid	0.58	0.6	5606	60
excel file format is not valid xls	1.34	0.5	7930	2
xlsx file format is not valid	0.28	0.5	4849	7
cannot open xlsx file format not valid	1.08	0.3	5167	89
excel file format is not valid	0.07	0.6	1464	53
microsoft excel file format is not valid	1.57	0.2	3511	77
excel error file format is not valid	1.84	0.4	9750	97
repair excel file format is not valid	1.45	0.2	1389	90
file format extension is not valid excel	0.4	0.7	9515	80
excel format or file extension not valid	0.65	0.7	1369	67
excel format is not valid	0.64	0.7	949	95
xls invalid file format	0.74	0.6	3448	100
xlsx file extension not valid	1.93	0.8	2687	59
excel file extension xlsx not valid	1.55	0.8	7517	70
file format is not valid excel xls	0.24	0.7	3032	24
excel file format or extension not valid	0.79	0.7	7522	97
can't open excel file format not valid	0.63	0.9	7171	80
xls file format is not valid	0.24	1	4485	13
excel format extension not valid	1.07	0.4	1902	71
excel file extension is not valid error	1.21	0.6	7781	36
excel file extenstion not valid	1.22	0.3	4952	84