batch file - Substring in a list of entries -

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i have variable contains list of filenames , based on extension, need perform different action. not able extract extension inside loop

set binaries=file1.dll fil2.dll fil3.sys  :: each file in list of binaries %%g in (%binaries%) (     :: if extension dll     if /i [%%g:~-4%]==[.dll] (         echo dll file         ) else (             echo sys file         ) )

if condition failing. how correctly extract extension.

if /i "%%~xg"==".dll"

from cmd shell window for /?:

 in addition, substitution of variable references has been enhanced. can use following optional syntax:      %~i         - expands %i removing surrounding quotes (")     %~fi        - expands %i qualified path name     %~di        - expands %i drive letter     %~pi        - expands %i path     %~ni        - expands %i file name     %~xi        - expands %i file extension     %~si        - expanded path contains short names     %~ai        - expands %i file attributes of file     %~ti        - expands %i date/time of file     %~zi        - expands %i size of file     %~$path:i   - searches directories listed in path                    environment variable , expands %i                    qualified name of first 1 found.                    if environment variable name not                    defined or file not found                    search, modifier expands                    empty string  modifiers can combined compound results:      %~dpi       - expands %i drive letter , path     %~nxi       - expands %i file name , extension     %~fsi       - expands %i full path name short names     %~dp$path:i - searches directories listed in path                    environment variable %i , expands                    drive letter , path of first 1 found.     %~ftzai     - expands %i dir output line

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