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I don't use awk in windows... but you can use the code of post #4 to check the columns of the files and the code of post #2 to merge the file.

I don't get any error.... try nawk instead of awk.

An awk statement has the form:

condition {action}

Conditions in awk control the execution of actions and actions are executed when the condition is true (1, 2, 3 or any value other then 0 or ""...

This prints the filename and the number of columns if it has more or less columns then the first row:
awk 'NR==1{n=NF}NF != n{print FILENAME " has " NF " columns"} 'file1.txt file2.txt file3.txt

Yes, awk stores the number of the columns in the internal variable NF.

For example:
awk '{print FILENAME, NF}' file1.txt file2.txt file3.txt

awk 'NR==1{print;next}FNR==1{next}1' file1.txt file2.txt file3.txt > outfile