Why do I get an Excel warning about file format and extension mismatch when I try to download an excel file?
57219
JSP generating Excel spreadsheet (XLS) to download
29442
Cannot import Excel (xls or xlsx) files which have non-ASCII characters in the name
30391
End user cannot open a .xls report exported from Salesforce
45648
How to get more information about "Error loading extension"?
154903
'BLOB is not a valid UTF-8 string' error?
37597
How to determine appropriate file extension from MIME Type in Java
41090
How would I go about creating a filename with invalid characters such as :?> ?
75185
Error With creating an excel file from java POI
1632
How do I fix a "Failed to download package files" error?
13435
here-document gives 'unexpected end of file' error
27913
Warning: "format not a string literal and no format arguments"
12928
download csv file
111810
How do I check the checksum of a download and why should I?
17328
Error: The processing instruction target matching "[xX][mM][lL]" is not allowed
42144
How do I load external images into Excel?
129754
Accidental format
35657
Unable to import data from a sample Excel file