Two issues.
1) WLATIN1 is a single byte encoding. So it can only represent 256 distinct characters. At least one of the characters in your file is not one of those characters. To fix this you need to start SAS using a different encoding. How to do that differs based on how you are running SAS. If you have it installed on your PC look for "SAS 9.4 (Unicode support)" icon in your Start menu.
2) Fixed column input will not work well with Unicode characters. Some characters use more than one byte, which will mess up the column counting. Does the data contain a delimiter between the fields? Post some of the lines of data as plain text instead of as an attachment. Just open the text file in a text editor and copy a few lines and paste them into the pop-up window that appears when you click the Insert Code icon in the forum editor (the icon looks like the character string < / > ).
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