Question : Using Form Fields to Launch Query

I have a form that I use to launch a query. I have fields on the form mapped on the query. See the example in the code window. It works fine by lets say for example I left the "txtpart" field empty on the form then launched the query no data would come back because its filtering the query using "null" or "" as its criteria. I tried using a * in the txtpart field but i get the same results. This applies for any field that is left blank when the query is ran.

Does anyone know what text needs to be in the field to allow a wild card? (anything goes or do not filter by this field when blank)

Code Snippet:

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(below is criteria loaded into the query criteria fields) [Forms]![ReportLauncher]![TXTID] [Forms]![ReportLauncher]![TXTPART] [Forms]![ReportLauncher]![TXTNOTES] [Forms]![ReportLauncher]![TXTINSPBY] Between [Forms]![ReportLauncher]![TXTSTARTDATE4] And [Forms]![ReportLauncher]![TXTENDDATE4] [Forms]![ReportLauncher]![TXTTOOLID] [Forms]![ReportLauncher]![TXTFAILED]

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Answer : Using Form Fields to Launch Query

Make that:
LIKE (iif(NZ([Field],"") = "","*",[Field])