xls2mysql is a php application shipped with a simple but easy to understand interface : one tab enables file uploading, the other displays the list of all files in the recipient directory. As such you can try the process many times without re uploading your file.

CRC32 Static Library for Microsoft VC++ was produced to make your CRC checking operations quick & easy to implement seamlessly without the need for an external DLL

The CRC is a "digital fingerprint" of a file, With CRC32 you can "melt down" a huge 20 MB (or even much bigger) file to have a small, handy reference to it, a single 32-bit number like 7d9c42fb (hexadecimal notation) which would unambiguously reflect the entire contents of this huge

Backup utility is a useful tool to simplify files and folders copying to the archives.
Backup Utility has build-in zip compression and easy access to archiving. You don't need any additional programs. But, if you prefer any external archiver, i.e. WinRar, you can use it too by setting one of program options.
Backup Utility operates the file lists. You can load, modify and save file list. Also program has AutoSave option..

[ASP] A program that allows backup and restore of files that span multiple floppy disks. It is not dependent upon the version of the DOS or Windows(tm) operating system. The floppy disks can already contain other files. The language of prompts and messages can be changed. The backup/restore process uses cyclic redundancy checks (CRC) to assure exact file integrity.

Zlib is a free general-purpose data-compression library. Integrity checks performed with the CRC-32 or the ADLER 32 checksums. In-memory operations use the zlib compressed data format (RFC 1950). Deflate (RFC 1951) is used for its compression algorithm. Typical compression ratios are between 2:1 and 5:1. The gzip format, RFC 1952, is supported for compressing files on a file system. Lacks support for PKZip 4.5, BZip2, and Deflate64.