MS-DOS 6.22 StepUp Appears to Have Duplicate Files

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MS-DOS 6.22 StepUp contains two types of binary patch files:

• Files with the filename extension .XX#. These files contain MS-DOS 6.0 checksums to patch MS-DOS 6.0 files to the MS-DOS 6.22 level. (Examples include XCOPY.EX# and SHARE.EX#.)
• Files with the filename extension .XX^. These files contain MS-DOS 6.2 (or MS-DOS 6.0/6.2 upgraded to MS-DOS 6.21) checksums to patch appropriate files to the MS-DOS 6.22 level. (Examples include XCOPY.EX^ and SHARE.EX^.)

Files with the filename extension .XX_ are standard compressed files that are expanded during the setup process. (Examples include DELOLDOS.EX_ and COUNTRY.TX_.)