using nmake wildcards makefile

i am attempting set adult an nmake makefile trade the balsamiq mockup files png files automatically, nonetheless i'm fearful i can't heads nor tails general order doing so, but definitely register files i wish exported.

sum management line syntax exporting files, contains an instance looks contains general order .obj files .exe files.

the makefile i have attempted distant looks this:

.bmml.png:
    "c:\program files\balsamiq mockups\balsamiq mockups.exe" trade $< $@

but doesn't work.

if i simply run nmake (with prehistoric png files), nmake only does this:

[c:\temp] :nmake

microsoft (r) way maintain concentration chronicle 9.00.30729.01
copyright (c) microsoft corporation.  rights reserved.


[c:\temp] :

if i ask build specific file, does this:

[c:\temp] :nmake "testfile.png"

microsoft (r) way maintain concentration chronicle 9.00.30729.01
copyright (c) microsoft corporation.  rights reserved.

nmake : lethal blunder u1073: don't know '"testfile.png"'
stop.

[c:\temp] :

any nmake gurus out there set me straight?

an instance makefile simply creates .dat files .txt files duplicating them, examination with, looks this:

.txt.dat:
    duplicate $< $@

this does zero well, clearly i'm bargain such general manners work. i need mention idea above somehow lists files i want?

---

edit: response new answer:

this makefile:

{}.txt{}.dat:
    duplicate $** $@

with record (test.dat)

1
2
3

and command:

nmake test.txt

produces blunder message:

[c:\] :nmake test.txt

microsoft (r) way maintain concentration chronicle 9.00.30729.01
copyright (c) microsoft corporation.  rights reserved.

nmake : lethal blunder u1073: don't know 'test.txt'
stop.