C:\TEMP>erase libfoo.a
C:\TEMP>set lfn=n
C:\TEMP>ar rcu libfoo.a a.o
C:\TEMP>erase libfoo.a
C:\TEMP>set lfn=y
C:\TEMP>ar rcu libfoo.a a.o
c:/a/djgpp201/bin/ar.exe: libfoo.a: Invalid operation
it seems to be OK when adding to an existing archive with either LFN=Y or LFN=N
----
C:\TEMP>ar -V
GNU c:/a/djgpp201/bin/ar.exe version 2.7
C:\TEMP>dir c:\djgpp201inr.exe
Volume in drive C is C @ WORK
Volume Serial Number is 16D3-1278
Directory of C:\A\djgpp201in
AR EXE 208,384 10-19-96 11:27a ar.exe
1 file(s) 208,384 bytes
0 dir(s) 51,290,112 bytes free
C:\TEMP>ver
Windows 95. [Version 4.00.950]