modified   csc.scm
@@ -101,7 +101,7 @@
 (define rc-compiler (quotewrap (if host-mode INSTALL_RC_COMPILER TARGET_RC_COMPILER)))
 (define linker (quotewrap (if host-mode host-cc default-cc)))
 (define c++-linker (quotewrap (if host-mode host-cxx default-cxx)))
-(define object-extension "o")
+(define object-extension "obj")
 (define library-extension "a")
 (define link-output-flag "-o ")
 (define executable-extension "")